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<br />e <br /> <br />e <br /> <br />e <br /> <br />FLOODPLAIN REPORT - Tyra Tract D and Sawmill Gulch, Breckenridge, Colorado <br /> <br />PROJECT OVERVIEW <br /> <br />The project site is located in the Town of Breckenridge in the southern part of Summit County, <br />Colorado. The Tyra Tract D site is in the west central portion of Breckenridge, while Sawmill <br />Gulch extends further south and west beyond the boundaries of the town (see Figure 1 at the end <br />of the report, a location map based on the U. S. Geological Survey (USGS) quadrangle). <br />Sawmill Gulch is a drainageway with significant watershed area: 2.5 square miles at its mouth, <br />and about 2.1 square miles at Four O'Clock Road. The gulch originates above timberline west of <br />the town, and then flows easterly and northerly until it discharges into the Blue River in the <br />central portion of Breckenridge. Four 0' Clock Road is a significant point of demarcation for <br />Sawmill Gulch. Downstream of Four O'Clock Road, Sawmill Gulch is under study by the <br />FEMA in conjunction with the Town of Breckenridge. The FEMA contractor, Foothills <br />Engineering Company (FEe) of Denver, Colorado, is in the process of preparing a revised study <br />for Sawmill Gulch from its confluence with the Blue River to Four O'Clock Road. The changes <br />reflect new hydrology and updated topography that have occurred since the adoption of the <br />effective 1979 FEMA Flood Insurance Study (FIS). FEC and WWE have coordinated common <br />data at Four O'Clock Road and will continue to do so. <br /> <br />For this report, Four O'Clock Road is the downstream study limit. The upstream limit is at the <br />current Town boundary, roughly one mile upstream of Four O'Clock Road. Two study reaches <br />are contained within the study limits: Tyra Tract D, which extends for about 500 feet upstream <br />of Four O'Clock Road, and upper Sawmill Gulch, which extends an additional 4,800 feet to the <br />southwest. <br /> <br />GENERAL FLOODPLAIN CONSIDERATIONS <br /> <br />Sawmill Gulch has a FEMA-designated floodplain. The currently effective FEMA study was <br />issued in 1979 and covers Sawmill Gulch from its confluence with the Blue River to about 1,000 <br />feet south (upstream) of Four O'Clock Road. The 1979 study is being revised by FEC and <br />WWE to reflect new hydrology and updated topography. In 1979 the FEMA floodplain was <br />based upon a 100-year peak flow of 120 cubic feet per second (cfs), but more recent studies place <br /> <br />971-055.010 <br /> <br />Wright Water Enginee~, Inc. <br /> <br />Page 2 <br />