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HomeMy WebLinkAbout1.0 Application1 Garfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 (970) 945-8212 www.garfield-county.com LAND USE CHANGE PERMIT APPLICATION FORM `TYPE OF APPLICATION Administrative Review ✓ Development in 100 -Year Floodplain ❑Limited Impact Review 0 Development in 100 -Year Floodplain Variance ❑Major Impact Review 0 Code Text Amendment nAmendments to an Approved LUCP 0 Rezoning LIR MIR SUP Zone District ❑PUD ❑PUD Amendment Minor Temporary Housing Facility ❑Administrative Interpretation ❑Vacation of a County Road/Public ROW ❑Appeal of Administrative Interpretation ❑Location and Extent Review ❑Areas and Activities of State Interest ❑Comprehensive Plan Amendment' ❑Accommodation Pursuant to Fair Housing Act Pipeline Development ❑Variance Time Extension (also check type of original application) INVOLVED PARTIES Owner/Applicant Name: John Powers Phone: (303 )449-2522 Mailing Address: 200 Alder Lane City: Boulder State: 00 Zip Code: 80304 E-mail:john@jpowers.org Representative (Authorization Required) Name: Fred Kuersten / Adolfo Gorra, Glenwood Structural & Civil Inc Phone: ( 970 ) 876-2519 / 928-0135 Mailing Address: 4555 County Road 214 / 812 Pitkin Ave City: Silt / Glenwood SpringsState: CO Zip Code: 81652 / 81601 E-mail:fkuersten@sopris.net / gsc@sopris.net PROJECT NAME AND LOCATION Project Name: Powers' bridge Assessor's Parcel Number: 2127-302-00-Q09 - - Physical/Street Address: 1046 Highway 325, Rifle, CO 81650 Legal Description: Sec 30 T5S R92W TR in NW; in E2NW, Lot 1 except that party lying easterly of a line containing 1.33 AC. M/L; 92 TR in Lots 1, 2 & E 1/2 NW; 92 TR NW Zone District: _Rural Property Size (acres): 53.6ac (part of 123 acres) PROJECT DESCRIPTION Existing Use: Irrigated agricultural acreage to raise hay and pasture livestock on the west and east sides of Rifle Creek. Current access from one side of the Creek to the other either requires leaving the property on Highway325 heading north and then driving east on County Road 251 to cross Rifle Creek, and then driving south on an access road adjacent to the Creek, or by driving across Rifle Creek at a crossing. Proposed Use (From Use Table 3-403): installation of bridge crossing to serve existing agricultural uses. Description of Project: to develop a bridge over Rifle Creek to facilitate access to Applicant's property east of the Creek. The bridge is proposed to be approximately 18' wide and 44'8" in length. Abutments are planned, and the bridge will be a clear span over the Creek. (Description continued on Attachment A) REQUEST FOR WAIVERS Submission Requirements ❑ The Applicant requesting a Waiver of Submission Requirements per Section 4-202. List: Section: Section: Section: Section: Waiver of Standards ❑ The Applicant is requesting a Waiver of Standards per Section 4-118. List: Section: Section: Section: Section: I have read the statements above and have provided the required attached information which is correct and accurate to the best of my knowledge. ttf i. 5/29/20 Signature of Property Owner or Authorized Representative, Title Date OFFICIAL USE ONLY File Number: _ _ _ _ - _ _ _ _ Fee Paid: $ ATTACHMENT A DESCRIPTION OF PROJECT (continued) Portions of the abutments may be(d(located within the 100 -year flood plain of Rifle Creek. FEMA flood plain mapping exists for the site (Community Panel 080205 0964 B). Pursuant to Table 3-301 roads and highway structures can be permitted in floodway and 100 -year Flood Plain subject to compliance with the County Flood Plain Regulations. Preliminary information from the Applicant's Representatives indicates that initial contacts with the Army Corp of Engineers have indicated that no Army Corp of Engineer's permits are anticipated to be required. This portion of the creek has benefitted from previous bank stabilization work and flows are improved by an upstream culvert installed by the Garfield County Highway Department on the County Road at the north end of Applicant's property. The Applicant has engineers working on the project, and staff of the Colorado Natural Heritage Project at Colorado State University restoring the riparian area also working on the project. Recorded at.. o'clock.... ..M., JUL 0 7 1937 Reception No.3S35.0 2 ecordor. PT Sale #62-1986 IS DEED, Made July Georgia Chamberlain as the Public Trustee, of the County of , .19 87 , between Colorado, and John P. Powers Garfield be:x 71.5 F GES37 Purchaser(s), WITNESSETH: Whereas, Thomas L. Emmer and Dorothy E. Enilner did, by Deed of Trust dated September 25 19 79 and recorded in the office of the Clerk: and Recorderofthe County of Garfield , Colorado, on October 17 19 79 , in Book 537 at Page 860 (Film No. , Reception No.298658)• convey to the Public. Trustee in Trust the property hereinafter described to secure the payment of the indebtedness provided in said Deed of Trust; and Whereas, violation having been made in certain of the terms and covenants of said Deed of Trust as shown by the notice of election and demandfor sale filed with the Public Trustee, a copy thereof being recorded in the office of said County Clerk and Recorder, the said property was advertised for sale at public; auction at the, place and in the manner provided by law and by said Deed of Trust and a copy of the notice of sale was in apt time mailed to the persons required by statute, and said property , was in pursuance of said notice sold to The Federal Land Bank of Wichita for the sum hereinafter set forth and a certificate of purchase thereof was made and recorded** and said certificate of purchase was assigned to John P. Powers on March 9, 1987, and said property not having been redeemed from said .sale; Now, Therefore, the Public Trustee pursuant to the power and authority vested in h er by law andby the said Deed of Trust as such. Public Trustee and in consideration . of the sum of .:$ 158,516.95 to the Public Trustee paid by the said Purchaser(s), the receipt whereof is hereby acknowledged, conveys. to the said Purchaser(s), h is heirs, successors and assigns forever*** all the right, title and interest which the Public Trustee acquired pursuant to said Deed of Trust in and to the following described property situate in the County of Garf-ield , Colorado, to wit:. That part of Lots 1 and 2, and Eli NWa`Section 30, Township 5 South, Range 92 West, 6th P.M., lying East ofthe center line of State Highway 325. Together with .5 second feet of water allowed to flow in the Rifle Creek Canyon Ditch under pr.ior:ity:number 80; .8 second feet of.:water allowed to flow in the Rifle Creek Canyon. Ditch under priority number 2; and together with .9 second feet of water allowed to flow in -the Grand Tunnel Ditch under priority number 2. Containing 123.56 acres, more or l:ess.,. • To Have, anti `to Hold the same unto the said Purchaser(s) h is heirs successors and assigns forever: r _ i. EMecutect t'he day;:and, year first .above written. iiksJ..[SEAL] as Public trustee of the County :of Garfield , Colorado. By Deputy Public Trustee ^ •f :,'. STATE OF COLORADO, 1 ;.1\:s,"" County of. Garfield ,;_,fie -foregoing instrument was acknowledged before me this 70(4)y r ; Georgai Chamberlain as the.. oti ty of^' Garfield , Colorado. • My commission expires ,April 21 , 1988 Witness my hand and official seal. • In counties where book and page numbers have been abolished. •• If certificate hna been assigned insert "and said certificate of forth name of corporation and state of incorporation. - ••• Change for Joint Tenancy. •6th Said A45-.0 July Public .Trustee of the • Notary Public • c was•easigned to (naming assignee)". If sale fs to a corporation, set No. 30 Rev. '66 PUBLIC TRUSTEE'S DEED.—Bradford Publishing Co., 1824-16 Stout Street, Denver, Colorado --4-77 qPublic.net Garfield County, CO Parcel Physical Address 5/29/2020 Owner Account Mailing Address Num 212730100213 212730100220 212730100223 212730200007 212730200008 212730200009 212730201003 212730201004 212730201005 212730201006 212730300002 212730300004 212730400958 Subject Property 488 County Rd 251, Rifle 0 County Rd 251, Rifle 452 County Rd 251, Rifle County Rd 251, Rifle County Rd 251, Rifle 1046 Hwy 325, Rifle 294 Mesa Dr, Rifle 332 Mesa Dr, Rifle 394 Mesa Dr, Rifle 420 Mesa Dr, Rifle 873 Hwy 325, Rifle 195 County Rd 297, Rifle Not available, Rifle Charles David & Annick Pruett Christina & Mathys Schweizer John C & Patricia A Owen John P Powers John P Powers John P Powers Zachariah J Friley Nondis L Lowther Ronald L & Carol J Byrd Mathew & Oliviya Daugherty Kenneth & Dorothea E Lowery X Bar Z Ranch LLC Bureau of Land Management R210854 R210870 R210873 R210696 R210697 R210698 R210062 R210063 R210064 R210065 R210212 R210474 R210904 488 County Road 251, Rifle, CO 81650 1215 Anchors Way #122 Ventura, CA 93001 PO Box 1905 Rifle, CO 81650 200 Alder Lane Boulder, CO 30304 200 Alder Lane Boulder, CO 80304 200 Alder Lane Boulder, CO 80304 294 Mesa Drive Rifle, CO 81650 332 Mesa Drive Rifle, CO 81650-9040 394 Mesa Dr Rifle, CO 81650 420 Mesa Drive Rifle, CO 81650 873 Highway 325 Rifle, CO 81650-9018 873 Highway 325 Rifle, CO 81650 2300 River Frontage Road Silt, CO 81652 Garfield County Land Explorer Garfield County Garfield County, Colorado 212731100376 Garfield County Land Explorer Printed by Web User 1 inch = 1,505 feet 1 inch = 0.28 miles +ti 0,2 0 4 0.8 Miles Garfield County Colorado Garfield County www.garfleld-county.com Colorado • Disclaimer This is a compilation of records as they appear In the Garfield County Offices affecting the area shown. This drawing is m be used only for reference purposes and the County Is not responsible for any Inaccuracies herein contained © Copyright Garfield County, Colorado 1 All Rights Reserved Printed: 11/3/2019 at 8:47:11 AM LC Garfield County CERTIFICATION OF MINERAL OWNER RESEARCH This form is to be completed and submitted with any application for a Land Use Change Permit. Mineral interests may be severed from surface right interests in real property. C.R.S. § 24-65.5-101, et seq, requires notification to mineral owners when a landowner applies for an application for development from a local government. As such, the landowner must research the current owners of mineral interests for the property. The Garfield County Land Use and Development Code of 2013 ("LUDC") Section 4-101(E)(1)(b)(4) requires written notice to owners of mineral interests in the subject property in accordance with C.R.S. § 24-65.5-101, et seq, "as such owners can be identified through the records in the office of the Clerk and Recorder or Assessor, or through other means." This form is proof of applicant's compliance with the Colorado Revised Statutes and the LUDC. The undersigned applicant certifies that mineral owners have been researched for the subject property as required pursuant to C.R.S. § 24-65.5-101, et seq, and Section 4-101 (E)(1)(b)(4) of the Garfield County Land Use and Development Code, as amended. As a result of that research, the undersigned applicant certifies the following (Please initial on the blank line next to the statement that accurately reflects the result of research): I own the entire mineral estate relative to the subject property; or X Minerals are owned by the parties listed below The names and addresses of any and all mineral owners identified are provided below (attach additional pages as necessary): Name of Mineral Owner Mailing Address of Mineral Owner see attached letter from Commonwealth Title I acknowledge I reviewed C.R.S. § 24-65.5-101, et seq, and I am in compliance with said statue and the LUDC. n1-enz 5/29/20 Applichn4's Signature Date 7 Commonwealth Title Company of Garfield County, Inc. 127 East 5th Street Rifle, Colorado 81650 Telephone: (970) 625-3300 Facsimile: (970) 625-3305 November 29, 2019 John P. Powers 1526 Dogwood Drive Rifle, Colorado 81650 Re: Mineral Owners for Parcel Numbers Dear John: We examined title to the minerals as reflected in recorded documents in the Garfield County Clerk and Recorder's Office for the following parcel: That part of Lots 1 and 2, and the E%NW% of Section 30, Township 5 South, Range 92 West of the 6th Principal Meridian, lying East of the center line of State Highway 325. As appears from the recorded documents in the Garfield County Clerk and Recorder's Office we examined for the above described parcel, and subject to reservations, exceptions and conditions contained in the United States Patent, easements, rights of way, liens, encumbrances, rights of parties in possession, liens, if any, of mechanics and materialmen, zoning and subdivision regulations, and any state of facts which an accurate survey would disclose, title to the minerals is vested in the following: Mineral Rights Owner Address (shown on recorded conveyance instrument or most recent recorded instrument) Piceance Royalty Partners, LLC P. O. Box 36157 Denver, Colorado 80236-0157; 410 17th Street, Suite 1150 Denver, Colorado 80202 Carmen Del Guercio 41750 Aspen Hollow Lane Steamboat Springs, Colorado 80487 Virgil Scarrow Lindell Scarrow 617 North 13th Street Humboldt, Kansas 66748 340 County Road 233 Rifle, Colorado 81650 John P. Powers 200 Alder Lane Boulder, Colorado 80304 Although we deem this information to be reliable, is not to be construed as an abstract of title, nor an opinion of title, nor a guaranty of title, and the Companies' liability is limited to the amount paid for the mineral examination. We expended at least 3 hours on the search of the records and compilation of data. The total due for the search is $375.00. The effective date of this mineral owner search is November 12, 2019. If you have any questions regarding this search, please contact me. Sincerely, Pari,ck, P. 131A-rw Patrick P. Burwell Glenwood Springs Branch 1322 Grand Avenue Glenwood Springs, Colorado 81601 Telephone: (970) 945-4444 Facsimile: (970) 945-4449 Garfield County PAYMENT AGREEMENT FORM GARFIELD COUNTY ("COUNTY") and Property Owner ("APPLICANT") John Powers agree as follows: 1. The Applicant has submitted to the County an application for the following Project: Powers' Bridge 2. The Applicant understands and agrees that Garfield County Resolution No. 2014-60, as amended, establishes a fee schedule for each type application, and the guidelines for the administration of the fee structure. 3. The Applicant and the County agree that because of the size, nature or scope of the proposed project, it is not possible at this time to ascertain the full extent of the costs involved in processing the application. The Applicant agrees to make payment of the Base Fee, established for the Project, and to thereafter permit additional costs to be billed to the Applicant. The Applicant agrees to make additional payments upon notification by the County, when they are necessary, as costs are incurred. 4. The Base Fee shall be in addition to and exclusive of any cost for publication or cost of consulting service determined necessary by the Board of County Commissioners for the consideration of an application or additional County staff time or expense not covered by the Base Fee. If actual recorded costs exceed the initial Base Fee, the Applicant shall pay additional billings to the County to reimburse the County for the processing of the Project. The Applicant acknowledges that all billing shall be paid prior to the final consideration by the County of any Land Use Change or Division of Land. I hereby agree to pay all fees related to this application: Billing Contact Person: Joh rl Powers Billing Contact Address: 200 Alder Lane City: Boulder Phone: (303)449-2522 Billing Contact Email: john©jpowers.org State: CO zip Code: 80304 Printed Name of Person Authorized to Sign: John Powers .6a (Signature) 5/29/20 (Date) 4/16/2020 .110 Powers Bridge Vicinity Map Google Maps yr :=:.Si • JOHN POWERS SITE PLAN FOR PROPOSED BRIDGE VICINITY MAP I/1\1/1\ GLENWOIM STRUCTURAL & CIVIL, INC. ENGINEERS I CONSTRUCTORS 812 Pitkin Avenue, Glenwood Springs CO 81601 gsc@sopris,net 1970.928.0135 Scale AS NOTED Job Number 19601 Designer/Drafter AG/KK Engineer Date Sheet AG 04/16/20 s1.1 Vicinity Map 212925300154 212730300004 7 1 2 110 311000 �r I • 212731200003 'ss 31 21273040095I vny r• •,w.� 6 CAST -IN-PLACE CONCRETE ABUTMENTS & WING WALLS ON SPREAD FOOTINGS AT FROST DEPTH 5596 \ RIFLE CREEK • 0 j ��onsv�'NI,. •`• • .`�' • a i a i a • a I 1 i 1 I 4 1 ■ •- J^S`94 1 4 ,\ 35'-0" MIN. CLEAR - FACE-TO-FACE OF _(5\--- TS �r0 x. \� I = • ■ 1?! rro %,itir rr fr,„7 PROPOSED BRIDGE DECK 44'-8"X18`0" (DOUBLE RAILROAD FLAT BED) TOP OF DECK ELEVATION= 5603 50 BOTTOM OF STRUCTURE= ELEVATION 5601.00 cO CP BENCH TOP OF FENCE POST ELEVATION: 5598.09 4'-0"EXISTING FENCE LINE TO SOUTH EDGE OF DECK O s EX/3 riNG FENCE 30° TYP. FOR FLOOPLAIN PERMITTING - STRUCTURAL DETAILS AND FINISH GRADING BEYOND ABUTMENTS TO BE COMPLETED SEPARATELY BRIDGE PLAN BASED ON SURVEY DATA PROVIDED BY TRUE NORTH COLORADO, LLC DATE MARCH 11 2019 STRUCTURE IS SUPERIMPOSED ON EXISTING GRADES - ROAD GRADES WILL BE REVISED TO APPROACH DECK @ ABUTMENTS JOHN POWERS SITE PLAN FOR PROPOSED BRIDGE BRIDGE PLAN GLENWOOD STRUCTURAL & CIVIL, INC. ENGINEERS I CONSTRUCTORS 812 Pitkin Avenue, Glenwood Springs CO 81601 gsc@sopris.net 1970.928.0135 Scale 1/16"=1'-0" Job Number 19601 Designer/Drafter AG/KK Engineer Date Sheet AG 5/4/20 S1.2 IVES. ' PO Box 248 Carbondale, CO 81623 (970) 947-9568 RESTOBATION.ORG April 13, 2020 Glenn Hartmann, Senior Planner Garfield County Community Development 108 8th Street, Suite #401 Glenwood Springs, CO 81601 RE: John Powers Bridge, Floodplain Compliance Dear Mr. Hartmann, The purpose of this memorandum is to certify a "No -Rise" in 100 -year water surface elevations at the proposed John Powers Bridge over Rifle Creek located at approximately 39°35'16.63" N latitude, 107° 45'49.71" W longitude (See Figure 1). This letter describes how the proposed modifications comply with the Garfield County Land Use and Development Code and Federal floodplain development guidelines. All elevation referenced in this memo refer to the North American Vertical Datum of 1988. Section 1- Introduction The project is located on private property in unincorporated Garfield County outside of an adopted detailed flood study area. For this analysis a preliminary Flood Insurance Rate Map (FIRM), dated October 26, 2011, was used to guide the development of the Existing Conditions and Proposed Conditions models for the determination of impacts to the flood conveyance. This preliminary FIRM panel is included as Attachment A. Prior to the development of this preliminary detailed flood study, the project area on Rifle Creek, located upstream of the City of Rifle municipal boundary, was described as Zone A and all delineations of Flood Hazard Zones were performed based on "Approximate Methods". Figure 1 Location Map of proposed John Powers Bridge over Rifle Creek John Powers Bridge - "No Rise" Compliance 1 IVES. PO Box 248 Carbondale, CO 81623 (970) 947-9568 RESTOBATION.ORG The proposed project involves the installation of a boxcar frame bridge over Rifle Creek to replace an existing low water crossing that provides landowner access for seasonal agricultural use. The proposed bridge will increase the access window and reduce in -channel maintenance of the crossing. The single span bridge will be mounted on concrete abutments to be built into the existing stream bank and will not require any piers to be built within the main channel of Rifle Creek. The current condition of the existing low water crossing is shown in Figure 2. This project has been designed to convey the 100 -year flood without increasing the preliminary BFE through the project reach. Figure 2 Existing low water crossing at the proposed location of the Powers Bridge over Rifle Creek Section 2 - Analysis No additional hydrologic investigation was performed for this study. Hydrologic input to the Existing and Proposed Conditions models was taken from the January 3, 1986 City of Rifle Colorado Flood Insurance Study, which describes a 100 -year discharge (1% Annual Flood) of 2,070 cubic feet per second (cfs) for Rifle Creek above its confluence with Government Creek (FEMA, 1986). An Existing Conditions HEC -RAS model was created based on Light Detection and Ranging (LiDAR) data flown in 2016 by the State of Colorado and obtained through the Colorado Hazard Mapping Program (NAVD 1988). The modeled reach extends approximately 170 feet downstream and 480 feet upstream of the proposed bridge location. In total, eight cross sections were cut from the 2016 LiDAR digital terrain Model. See Figure 5 for the cross-section locations. Manning's n values for both the John Powers Bridge - "No Rise" Compliance 2 Or) IVES. ' PO Box 248 Carbondale, CO 81623 (970) 947-9568 RESTORATION.ORG existing and proposed conditions models are from HEC -RAS Hydraulic Reference Manual (US Army Corps of Engineers, Hydrologic Engineering Center, 2016). Table 1 — Select Mannings Roughness Value (from Chow Location Description Manning's n value Main channel Mountain Streams, no vegetation in channel, banks usually steep, with trees and brush on banks submerged, (a.) Bottom: gravels, cobbles and few boulders. 0.040 Floodplain Flood Plains with light brush and trees in summer. 0.06 Figure 3 shows the condition of the channel immediately upstream of the proposed bridge location on March 6, 2020 during a field visit to the site. The downstream boundary condition for the model was set at River Station 2+49.54 as a known 100 -year water surface elevation of 5599 feet, which was obtained from the rectified preliminary 2011 FIRM panel. Figure 3 Rifle Creek immediately upstream of the proposed Powers Bridge location A model representing the proposed changes (Proposed Conditions model) was created by altering the Existing Conditions model between RS 4+13.03 and 4+31.03 to add the proposed single span bridge. The bridge deck elevation was set at 5603.5 feet and the span was set to 35 feet, per the project plans currently under development. The low chord of the bridge was calculated as 5598.5 feet based on the 2.5 -foot thickness of the boxcar frame. Ineffective Flow Areas for the bridge were established upstream based on a 1:1 contraction ratio and downstream based on a 2:1 expansion ratio. Standard Contraction John Powers Bridge - "No Rise" Compliance 3 IVES. PO Box 248 Carbondale, CO 81623 (970) 947-9568 RESTOBATION.ORG and Expansion Coefficients were also modified at RS 4+13.03 and 4+31.03 to 0.3 and 0.5 respectively. The low flow method was set to use the highest energy answer between the Energy (standard step) and Momentum equations. The high flow bridge modeling approach used for this analysis was set to Pressure and/or Weir flow with no changes to the default coefficients. All other model variables were left unchanged between the Existing and Proposed Conditions models. Section 3 - Results RiverRestoration was unable to obtain the any previous modeling used to develop the preliminary BFE's for the John Powers bridge reach. To evaluate how the proposed changes would impact flood hazard zoning, the 2011 preliminary FIRM map was geo-rectified to establish BFEs within the reach. Linear interpolation was then performed between BFE 5599 and 5604 as well as between 5604 and 5609 to establish the preliminary Effective Conditions Water Surface Elevation (WSE) at each cross section within the Existing and Proposed Conditions models. Results presented in Table 2 show that neither Existing nor Proposed Conditions calculated flood elevations exceed the preliminary Effective Conditions, within the project reach. Figure 4 shows a plot of the HEC -RAS model outputs for both Existing and Proposed Conditions. The HEC -RAS models used for this analysis are available upon request. Table 2. Effective, Existing and Proposed Conditions model outputs, NAVD 1988 Location Description River Station (feet) Preliminary Existing Effective Conditions Model WSE Model WSE (feet) (feet) Comparison Existing & Preliminary Effective WSE (feet) Proposed Conditions Model WSE (feet) Comparison Proposed & Preliminary Effective WSE (feet) FEMA BFE 5604 FEMA XS BN Powers Bridge US Powers Bridge DS FEMA BFE 5599 908.1 757.96 682.2 648.53 523.73 431.03 413.03 350.3 249.54 (ft) (ft) 5605.00 5602.97 5602.08 5601.68 5599.72 5599.46 5599.43 5598.77 5599.00 5605.49 5604.47 5604.00 5603.67 5602.06 5601.00 5600.78 5599.98 5599.00 Interpolated Water -Surface Elevations Shown in Bold (ft) - 0.49 - 1.50 - 1.92 - 1.99 - 2.34 - 1.54 - 1.35 - 1.21 0.00 (ft) 5605.01 5603.06 5602.01 5601.54 5600.00 5599.99 5598.92 5598.77 5599.00 (ft) - 0.48 - 1.41 - 1.99 - 2.13 - 2.06 - 1.01 - 1.86 - 1.21 0.00 Figure 5 shows the Existing and Proposed Conditions HEC -RAS model cross sections relative to the proposed bridge location. The Proposed Conditions WSEs and 100 -year flooding extents are also shown in blue. Note Proposed Conditions WSE do not overtop the riverbanks, remaining in -channel for the entirety of the reach. John Powers Bridge - "No Rise" Compliance 4 JVER ESTORATION.OKG ' PO Box 248 Carbondale, CO 81623 (970) 947-9568 5605- 5605- 5600 5600 4- - c o - a a) - w 5595- 5590 Powers Bridge Floodplain Impacts Study Proposed Bridge Plan: 1) EC 2) PC M � M 0) O L() N M N N 300 400 500 600 700 800 900 Main Channel Distance (ft) Legend EG 100 -yr - EC EG 100 -yr - PC WS 100 -yr- PC WS 100 -yr- EC Crit 100 -yr- EC Crit 100 -yr- PC Ground Figure 4 HEC -RAS plot of Existing and Proposed Conditions model 100 year water surface profiles John Powers Bridge - "No Rise" Compliance 5 JVER ESTORATION.ORG ' PO Box 248 Carbondale, CO 81623 (970) 947-9568 Figure 5 Plot showing Proposed Conditions HEC -RAS model layout with calculated water surface elevations and delineated water surface extents (in blue) John Powers Bridge - "No Rise" Compliance 6 JVER ESTORATION.ORG ' PO Box 248 Carbondale, CO 81623 (970) 947-9568 In summary, modeling of the proposed project demonstrates the project does not increase the preliminary Effective BFEs and thus does not expand the established Floodplain limits. This project complies with the requirements of a No -Rise Certification and no alteration to the Effective BFE's and floodplain extents from their current state is recommended. Please contact RiverRestoration with any questions concerning the analysis or the project. Sincerely, Quinn Donnelly, P.E. (CO #56481) River Engineer, RiverRestoration, LLC quinn.donnelly@riverrestoration.org (970) 947-9568 John Powers Bridge - "No Rise" Compliance 7 JVERESTORATION.ORG 9' ) PO Box 248 Carbondale, CO 81623 (970) 947-9568 Attachment A: Preliminary Effective Flood Insurance Rate Map for the John Powers Bridge Site John Powers Bridge - "No Rise" Compliance 8 XIVER RESTORATION.ORG IP/ PO Box 248 Carbondale, CO 81623 (970) 947-9568 NOTES TO USERS • !iota PEW rrt•lam• Y./ nga •••.•• och 11,1, •1[MO.,5••1 WY, ••••,`",/eS•i•. .111•01••04T, .ttni•ASTM,••••,••••• •••• 'F.1:::L!'"TI•1•71 RP, .4,Hrrvore-4,11.. '4, • - • T[4:0111-• LEGEND =IP Or n•F 1=.r. 221=1•%•..?2:2=.1.. •••=14r32,1 o aDs • E=',1 CO•31.11•110.1.60,059,51 nnmrro wars a:ft, •.••0 John Powers Bridge - "No Rise" Compliance 9 MIVEL 1010E FIRM ROOD MEARANCE ROE MAP GARDIELD CO Mr!, COLORADO AND 1.41.0.119 PAIM.1•131.31•11 .,,•••••••..r•pnpy =e3W. eVZ Ta- •.•. • HAP NURSER 0115t14 EFFFCTIvE DATE GLENWOOD STRUCTURAL &CIVIL, INC. tRGIREERS 1 CONSTHIUC1EfRS June 10, 2020 Garfield County Community Development 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Attn: Glenn Hartmann, Senior Planner Re: John Powers Bridge, Floodplain Compliance Project No. 19601 Dear Mr. Hartmann, This is submitted as a supplement to River Restoration's "No -Rise" certification memorandum dated April 13, 2020. In particular, we would like to address project compliance with Land Use Code Articles 3-301 and 4-109. Section 3-301 covers the floodplain overlay regulations. The "No -Rise" analysis submitted demonstrates that drainage due to bridge construction as proposed will not adversely impact adjacent properties. Construction and materials will adequately resist hydraulic loading. The bottom of bridge structure will be set at elevation 5601.00 providing a 1 -foot minimum flood elevation clearance. Article 4-109 regulates development in the 100 -year floodplain. In this !ow -flow crossing, it will be very feasible to adequately convey water and manage the project to minimize sediment transport. Best management practices will be followed and there will be no impact to vegetation. To the best of our understanding, all planned aspects of the project will comply with sections 3- 301 and 4-109. If there is anything further we should address in this regard, please feel free to contact us. Respectfully Submitted, GLENWOOD STRUCTURAL AND CIVIL, INC. Adolfo 0. Gorra, M.S., P.E. President c:lusersladolfoldocumentslsharesljobsldesign1196o1-fred kuersten-powersbridgetgeneraillet-Barco-powers-20o610.docx Please visit our website at www.glenwoodstructurai.org 812 Pitkin Avenue • Glenwood Springs, CO 81601 • email: gsc@sooris.net • Phone (970) 928-0135