FLOOD10363 ‎(2)‎

• County: Gunnison
• Community: Gunnison County
• Stream Name: East River, Cement Creek, Alkali Creek, Ohio Creek
• Title: Gunnison County Flood Hydrology, Contract # W99-D-0018 Final Report
• Date: 11/1/2004
• Prepared For: US Army Corps of Engineers, CWCB and Gunnison County
• Prepared By: Tetra Tech, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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5.9 TAYLOR RIVER AT ALMONT

5.9.1 Description of Taylor River at Almont

Taylor River at Almont is located just upstream of the Taylor River and East River confluence. The Taylor
River at this point has a total drainage area of 477 square miles at the gage. There is an extensive record
from the Taylor River at Almont USGS gage (ID# 09110000).

5.9.2 Flood Records for Taylor River at Almont

The Taylor River at Almont USGS gage is located in this reach. This gage provides a record of reported
peak flows for 1913,1916, and 1919 through 2000. However, since this gage is affected by the
operations of Taylor Park Reservoir, the regulated data is transformed to unregulated flows by accounting
for the daily change in storage (see Section 4.3). Unfortunately, daily storage information is not available
for the Taylor Park Reservoir (construction began in 1935) until 1958. Therefore, there is a gap in data for
these years, as unregulated flow data could not be simulated.

The travel time from Taylor Reservoir to the Taylor River at A1mont gage is estimated to be less than 12
hours; therefore, no lag is applied in the conversion to an unregulated data set.

An estimate of the instantaneous peak flows to corresponding daily values is determined for this gage
using values prior to 1935. The ratio of 1.1164 peak-to-daily flows is determined by plotting a straight
trend line for the data. The R2 value for the line is 0.95 as shown in Figure 5.9.2.1. This ratio is applied to
the maximum daily value for each year of the unregulated data set to estimate peak values. The peak
flows for the USGS gage Taylor River at Almont are presented in Appendix A - Table A.9.

The REGFREQ program was used to determine the correlation of the available flow data to nearby gages
on the Gunnison River system. A high degree of correlation (>0.9) between the deregulated Taylor River
at A1mont gage and the following gages was found.

· Taylor River below Taylor Park Reservoir (09109000)
· East River at Almont (09112500)

The East River at A1mont gage was chosen to expand the data set for the Taylor River at A1mont daily
stream gage flows. The East River at Almont gage has a continuous record from 1935 through 2000,
while Taylor River below Taylor Reservoir has the same period of record due to the deregulation
procedure. The resulting family of flow records is presented in Appendix A - Table A.9.

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