FLOOD03888

• Designation Number: 388
• County: Summit
• Community: Unincorporated Summit County
• Basin: Colorado Mainstem
• Title: Flood Insurance Study - Summit County, CO, Unincorporated Areas
• Date: 11/1/1994
• Designation Date: 11/1/1994
• Floodplain - Doc Type: Floodplain Report/Masterplan

above the confluence with West Tenmile Creek. The basin width is
7 miles and the total basin length is about 14 miles. The creek
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and 2.7 percent in the upper basin. The elevations in the basin
range from 13,000 feet above Copper Mountain to 9,000 feet at
Lake Dillon. The study reaches within this basin are portions of
Tenmile Creek adjacent to and within the Town of Frisco.

The Meadow Creek Basin drains to the east from the Gore Range
into Dillon Reservoir at Frisco, just north of Lower Tenmile
Creek. The basin has a total drainage area of 5.8 square miles
and a length of 4.5 miles. The width of the basin varies from
1.0 to 1.5 miles. The channel slope averages 1.7 percent for the
study reach near Frisco while steeper slopes of 10.7 percent
exist above Frisco in the Gore Range. The elevations in the
basin range from 12,700 feet to 9,000 feet at Dillon Reservoir.
The study reaches within this basin are portions of Meadow Creek
adjacent to the Town of Frisco, with some segments located within
the Town's corporate limits.

I

Miners Creek Basin is located to the east of Tenmile Range, with
the ridge to the east of Peak 4 being the southern boundary of
the basin. The basin has a drainage area of 6.8 square miles
which drains east into Miners Creek, then north to Dillon
Reservoir. Jug Creek and No Name Creek are tributaries of Miners
Creek. The study reach within the basin is a segment along
Miners Creek.

The Breckenridge Floodplain Information Report (Reference 8),
completed in 1975, derived frequency-discharge relationships for
certain tributaries within the Town of Breckenridge. Synthetic
storms were derived from the statistical analysis of rainfall
data as presented in Technical Paper 40 of the U.S. Department of
Commerce, Weather Service. The peak flow rate data for French
Gulch and the Blue River (downstream of Goose Pasture Tarn) are
contained in the 1975 report, and provide peak flow rates for the
10-, 100-, and 500-year recurrence intervals.

The Hydrology Report for the summit County Flood Insurance Study
completed in 1978 (Reference 6) contained the discharge-frequency
data that are tabulated in the published Flood Insurance Study.
Stream gage data for a particular study reach were statistically
analyzed to compute peak flow rates for specific recurrence
intervals. This was done for the Snake River using data from
Gage No. 475 and for Tenmile Creek using data from Gage No. 501.
Adjustments for locations other than at the gage station were
made by making a discharge versus drainage area comparison.

A regional regression analysis was performed to provide a basis
for estimating flows from ungaged drainage basins having similar
characteristics of gaged drainage basins. A single variable
(drainage area) algorithm was developed from the regression
analysis for each selected flood frequency. These algorithms
were converted into a graphical depiction (Reference 6) of

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