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<br />I. INTRODUCTION.
<br />
<br />Iluringthe latter part of September, 1976, the San Juan National
<br />Forest conducted a water quality study.of Williams Creek and
<br />Williams Creek Reservoir. This study was undertaken because. of
<br />the noticeable increase in algae and change in color of both the
<br />stream and reservoir during the summer of 1976 (see photographs
<br />Appendix B). The objective of this investigation is to determine
<br />if there is a water quality problem, why it exists, and should
<br />corrective action be initiated.
<br />
<br />.. This report summarizes and interprets physical. and chemical data
<br />collected thus far on Williams Creek and the Reservoir. Ten water
<br />quality stations were established. Photographs of the stream and
<br />reservoir appear in Appendix B. Figure I notes their location,
<br />and Figure II contains detail of the reservoir and a vicinity map.
<br />Chapter III contains a summary of the report and therecoromendations
<br />based on the data, while Chapters IV and V comprise the data analysis
<br />and actual data.
<br />
<br />. II. DESCRIPTION OF AREA
<br />
<br />Williams Creek is a tributary of the Piedra River and is located
<br />on the Piedra Ranger District of the San Juan National Forest. The
<br />drainage area is approximately 47.5 square miles.
<br />
<br />The climate of the area is continental-mountainous. Summers are
<br />cool with frequent showers in July and, August ~~ile winter snows
<br />are heavy. Relative humidity is usually low, most days are sunny,
<br />daily temperature fluctuations are high, and average temperatures
<br />vary inversely with elevation. Average annual precipitation varies
<br />from 25 - 45 inches with approximately 50% of that or 18 inches
<br />running off yielding an average runoff of 45,000 acre-feet. The
<br />vegetation, geology, and soils of the area are detailed in the Piedra
<br />Ared Soil Survey.
<br />
<br />Williams Creek Reservoir was constructed by. the Colorado Division of
<br />Wildlife in 1958 solely for recreation use. It does not fluctuate
<br />because of irrigation drawdown. It floods 350 acres and reaches a
<br />maximum depth of 77 feet. Assuming an average depth of 25 feet would
<br />give an estimated capacity of 8700 acre-feet. Use of the reservoir
<br />has grown from about 23,000 visitor days in 1966 to 54,000 visitor
<br />days in 1975 and .is expected to keep growing. This makes it a key
<br />recreation area on the San Juan National Forest and its water quality
<br />important to maintain.
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