9433

• UCREFRP Catalog Number: 9433
• Author: Anderson, R.
• Title: Riverine Fish Flow Investigations.
• USFW Year: 2002.
• USFW - Doc Type: Federal Aid Project F-288-R5,
• Copyright Material: NO

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riffle was surveyed on August 8 and 9 and again on October 19 and 20, 2000. Waterline shots
were made on June 27 and 28,2001, and at a lower flow on July 31 and August 1.

Colorado River, Clifton study site

A second study site in the IS-Mile Reach of the Colorado River was labeled the Clifton
station. A 4.25 kilometer stretch of the between river miles 177.7 and 180.4 was surveyed on
May 31, June 1,2,4 and 5, 2000. This site is just upstream of the original site, surveyed in 1999,
now called the Corn Lake station but in prior reports it was named the IS-Mile Reach station. A
total of 45,000 usable bathymetric survey points were collected at the Clifton station using the
boat GPS/sonar equipment.

Aerial photography of the 15Mile reach of the Colorado River has been digitized by
Mesa County Survey System and was purchased from them to aid in identification of landmarks
and waterline boundaries. We accomplished this by using the latitude and longitude brass
marker at the intersection of 31 and C Road for a reference pin for our survey. Therefore, both
the Corn Lake and Clifton survey can have associated photography.

Waterline/water surface measurements were taken with the GPS walking method on
August 1,2 and 3,2000, January 23,24,25 and 26, 2001 and the final set on June 18,19 and 20,
2001.

Dolores River, Big Gypsum study site

Over a three-day period, May 16, 17, and 18,2000, bathymetric data was collected along
a 3-km section of the Dolores in the Gypsum valley. As was the case with the Yampa River,
there were lower than normal runoff flows made data collection using the sonar more difficult
and certain parts of the river were too shallow for the sonar. Several days were spent in June and
July 2000 logging addition points by the walking method. This walking method logs points from
the GPS with a Psion data collector running Field Face software. Waterline/water surface shots
were made on July 6 and 7,2000 and on June 13 and 14,2001.

Acoustic Doppler and Marsh McBernie Velocity Meters

For model calibration, it is important to have observed measurements of depth and
velocity at known flows. While depth can be gathered using the same technologies that are used
in determining bathymetry, velocity measurements require another set of instruments. Two
different technologies were used for measuring velocities in this project, the GPS and flow
meter/wading rod, and the GPS and Acoustic Doppler. Because of low summer flows the boat-
mounted acoustic-Doppler was not used to gather velocity data in 2000. A detail description of
both techniques was given in Anderson and Stewart (2000).

Data Reduction and Preparation

The use of GPS, sonar, and the COMLOG program produced a large number of
coordinate points at each site, and data sets had to be checked for quality and quantity. The