FLOOD08946

• County: Eagle
• Community: Vail
• Stream Name: Gore Creek
• Basin: Colorado Mainstem
• Title: Gore Creek Floodplain Information
• Date: 6/1/1975
• Prepared For: Vail
• Prepared By: HYDRO-TRIAD, LTD.
• Floodplain - Doc Type: Floodplain Report/Masterplan

V. BLACK LAKE DAMS

The Black lakes experience high inflow from both thunderstorms
andsnowme1t. Snowme1t discharges which occur with a diurnal pattern
over several days will result in a fairly uniform discharge since the

lakes will effectively buffer the diurnal oscillations. Theprojected
500 year snowmelt spillway discharges for Black lake and Black lake
No.2 are 150 and 290 cubic feet, respectively. If the 500 year

..

.

'.,

"

derived rainstorm is applied to these basins, the spillway discharges
are 30 and 445 cubic feet per second. This, however, is an unlikely
situation since a thunderstorm cell would tend to move eastward rather

FIGURE IV.11 Town of Vail Golf Course
100 Year Water Depth 0.8 feet

than remain over the top of the Vail Pass ridge for any length of time.

81ack Lake 1ies just below Yail Pass and has only 0.63 squaremi1es

of drainage area. This small area, coupled with the 19-acre surface

area completely swallows the runoff from a thunderstorm. Thus, the

snowmelt discharge whiCh occurs for the better part of a day produces
the design discharge. The spillway, as seen in Figures V-I and Y-2

is four feet deep and approximately nine feet wide at the bottom with
2:1 side slopes. The spillway is constructed with grouted stones
and is currently in reasonably good repair. The spillway depth for
the 150 cfs, 500 year projected snowmelt is 3.0 feet, which provides
a one. foot freeboard. A discharge curve for 81ack lake can be Seen
in FigureV-3. Consequent1y, the Upper Black Lake and spillway are

considered adequate for both the 500 year snowmelt and thunderstorm

FIGURE IV-12 Bridge west from confluence of Gore and Black Gore
Creeks at Section 64
100 Year ~ater Depth 5.9 feet

events.