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<br />for Boulder County in cooperation with the Colorado Water
<br />Conservation Board. The contour interval on all mapping was two-
<br />feet. The horizontal scale of all mapping above Lyons was one-
<br />inch equal to 100-feet, while the horizontal scale of all mapping
<br />below Lyons was one-inch equal to 200-feet.
<br />
<br />limits of this study were St. Vrain Creek at Airport Road (85th
<br />Street) to St. Vrain Creek at 119th Street.
<br />
<br />Hydrology for the study was compiled by Boulder County based on
<br />information obtained from existing hydrologic studies of the St.
<br />Vrain.
<br />
<br />A report titled "Floodplain Information Report, St. Vrain Canyon
<br />Upstream of Lyons, Boulder County, Colorado," was prepared by
<br />Camp, Dresser and McKee, Inc., of Denver, Colorado, October, 1978
<br />(Reference 5). The Camp, Dresser and McKee report included
<br />information on the South and Middle St. Vrain Creek floodplains
<br />from Lyons to Peaceful Valley, Colorado.
<br />
<br />1.4 Related Flood Studies
<br />
<br />Gingery Associates, Inc., prepared a flood insurance study for
<br />the City of Longmont in January, 1977 (Reference 6). The study
<br />included St. Vrain Creek from Airport Road to 119th Street.
<br />
<br />A report titled "Floodplain Information, Lower St. Vrain Creek,
<br />Volume III," June, 1972, (Reference I) was prepared by the U.S.
<br />Army Corps of Engineers, Omaha District for the Denver Regional
<br />Council of Governments Urban Drainage and Flood Control District,
<br />Boulder County, and the City of Longmont. The Corps report
<br />included floodplain information on approximately 1.5 miles of the
<br />St. Vrain immediately upstream of Airport Road (85th Street),
<br />which is the downstream limit of this current report.
<br />
<br />A report titled "Floodplain Information, Upper St. Vrain Creek,
<br />Volume IV," September, 1972, (Reference 2) was prepared by the
<br />U.S. Army Corps of Engineers, Omaha District, for the Denver
<br />Regional Council of Governments Urban Drainage and Flood Control
<br />District and Boulder County. This report included floodplain
<br />information for approximately five (5) miles of St. Vrain Creek
<br />downstream of Lyons and approximately four (4) miles of North St.
<br />Vrain Creek upstream of Lyons.
<br />
<br />A Flood Insurance Study for Lyons, Colorado, (Reference 3) was
<br />prepared by the Federal Insurance Administration in February.
<br />1980. This study contained North and South St. Vrain Creek flood
<br />profiles through the town of Lyons. The hydrologic and hydraulic
<br />analyses used in the study were completed in October, 1977, by
<br />the firm of Howard, Needles, Tammen and Bergendoff. Generally,
<br />the hydrologic data used was that generated by the Corps of
<br />Engineers for the 1972 studies of the Upper and Lower St. Vrain.
<br />
<br />Wat.er Resources Consultants, Inc. prepared a report titled
<br />"Floodplain Information, Flood Control and Floodplain Management
<br />Plan for St. Vrain Creek at Longmont, Colorado," dated April,
<br />1981, under the auspices of the City of Longmont, Boulder County,
<br />and the Colorado Water Conservation Board (Reference 4). The
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