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<br />Roaring Fork River
<br />Floodplain Information Report
<br />
<br />Town of Basalt, Eagle & Pitkin Counties, Colorado
<br />
<br />Roaring Fork River
<br />Floodplain [nfonnation Report
<br />
<br />Town of Basalt, Eagle & Pitkin Counties, Colorado
<br />
<br />PREFACE
<br />
<br />SECTION 1 - INTRODUCTION
<br />
<br />This report presents the results of a floodplain study for the Roaring Fork River in Eagle & Pitkin
<br />Counties and the Town of Basalt, Colorado, The Report was prepared by Matrix Design Group, Inc, of
<br />Denver, Colorado at the request of the Town of Basall Board of Trustees and Pitkin County in
<br />cooperation with the Colorado Waler Conservation Board,
<br />
<br />1.1 Authorization
<br />
<br />This report was authorized by the Colorado Waler Conservalion Board in joint sponsorship with the
<br />Town of Basalt, and Eagle & Pitkin Counlies, Colorado,
<br />
<br />Town of Basalt
<br />101 Midland Avenue
<br />Basalt, Colorado 81621
<br />
<br />The Board's power and duty is to devise and formulate methods, means and plans for bringing about the
<br />greater utilization of the waters of the state and prevention of flood damages there from and to designate
<br />and approve storm or flood way runoff channels or basins, and 10 make such designations available to
<br />legislative bodies of cities and incorporated lowns; to county planning commissions; and to boards of
<br />adjustment of cities; incorporated towns; and counties of Ihis state as stated in Section 37-60-105 (I) ( C )
<br />of the Colorado revised Statutes 1973,
<br />
<br />Copies of Ihis report are available for public inspection or dislribution, for a nominal fee, at the offices
<br />listed below,
<br />
<br />Pitkin County Public Works
<br />76 Service Center Rdad
<br />Aspen, Colorado 81611
<br />
<br />The cities, incorporaled towns, and counties within the study area may provide zoning regulations to
<br />establish, regulate, restrict, and limit such uses on or along any stream or floodwater runoff channel or
<br />basin, as such storm or flood water runoff channel or basin, as such storm or floodwater runoff channel or
<br />basin has been designated and approved by the Colorado Water Conservation Board, in order to lessen or
<br />avoid the hazards to persons or damage to property resulting from the accumulation of storm or flood
<br />waters, as stated in Sections 30,28-111 and 31-23-201 of the Colorado Revised Statutes, 1975, Upon
<br />official approval of this report by the Colorado Water Conservation Board, the areas described as being
<br />inundated by the 1 DO-year flood may be designated as flood hazard areas and their use regulated
<br />accordingly by local governmental entities,
<br />
<br />Colorado Water Conservation Board
<br />1313 Sherman Street, Room 721
<br />Denver, Colorado 80203
<br />
<br />1.2 Previous Studies
<br />
<br />Matrix Design Group, Inc.
<br />1601 Blake Street, Suite 508
<br />Denver, Colorado 80202
<br />
<br />The Roaring Fork River floodplain was originally studied by Wright-McLaughlin Engineers in August
<br />1976 for Pitkin County, and in February 1978 for Eagle County,
<br />
<br />The hydrologic and hydraulic analyses for the Roaring Fork River in Eagle County were performed by
<br />Gingery Associates, Inc, for the Federal Insurance Administration, under Contract no, H-4549, This
<br />work, which was completed in January 1979 and published in May 1980, covered all significant flooding
<br />sources affecting the unincorporated areas of Eagle County,
<br />
<br />The hydrologic and hydraulic analyses for the Roaring Fork River in Basalt and unincorporated Pitkin
<br />County were performed by Denver Engineering Corporation (DEC), for the Federal Emergency
<br />Management Agency (FEMA), under Contract No, EMW-C-1184, The DEC work was completed in
<br />April 1985, The Flood Insurance Study for the Town of Basalt was published June 4, 1987,
<br />
<br />FEMA realized many changes had occurred in the river since the previous studies and a new study was
<br />needed, In 1997 through 1999, J,F. Salo & Associates, Inc, contracted with FEMA to redefine the 100.
<br />year floodplain and floodway, beginning at the Garfield/Eagle County line and extending upstream
<br />through the Wingo Bridge, A HEC-RAS model was developed and floodplain mapping prepared for
<br />submittal to FEMA. The Town of Basalt objected to the delineation, and Mr. John Liou of FEMA Region
<br />VIII visited the site to investigate concerns, specifically the split flow that may occur at the Upper Basalt
<br />Bypass Bridge on Highway 82, According to Mr. Liou, the levee constructed upstream of the bridge is
<br />not a "FEMA compliant levee," and the model was re-run to show a split flow scenario, The model was
<br />submitted to FEMA, but never approved,
<br />
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