FLOOD00385

• County: Boulder
• Community: Boulder
• Stream Name: Boulder Creek
• Title: South Boulder Creek Interim Hydrology Study
• Date: 7/1/2000
• Prepared For: Boulder County
• Prepared By: Taggart Engineering Associates, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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HISTORICAL FLOODS AND HYDROLOGY COMPARISON

The G&O study presented gage data for South Boulder Creek at Eldorado Springs
for peak flows greater than 1,000 cfs. These data appear to be taken from the
1969 Corps of Engineers Floodplain Information Report, except that the May 7,
1 969 is updated from "preliminary estimates." We have checked flow data
through 1999 and there have been no additional flood peaks reported greater than
1 000 cfs.

TABLE 11-2

Historical Peak Discharges on South Boulder Creek
at Gaging Station Near Eldorado Springs 1

Drainage Area: 109 Square Miles
Location: 6.7 miles downstream from Gross Reservoir
and 1 mile west of Eldorado Springs

Peak Discharges2.3
Date of Occurrence CFS
3 Jun 1895 1130
9 May 1990 1100
20 Jun 1909 1340
24 May 1914 1240
6 Jun 1921 1440
'2 Sep 1938 7390
21 Jun 1947 1290
6 Jun 1949 1430
18 Jun 1951 2370
4 Jun 1952 1080
7 May 1969 1690

1 Records taken from United States Department of Interior Geological Survey, "Water-Supply
Papers 1310 and 1680" and the yearly "Water Surface Records for Colorado. n

2 Only peak discharges which exceeded 1,000 cubic feet per second lets) are listed.

3 There have been no events reported greater than 1,000 cfs through 1999.