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, . , . I I I I I I I I I I I I . . ..( . " SCOPE This report presents the results of a soils and geologic reconnaissance investigation of the Morrison Exchange Reservoir located in Jefferson County, about 1 mile east of Morrison, Colorado. The reservoir will be located in the south half of Section 36, Township 4 South, Range 70 West, and in the north half of Section I, Township 5 South, Range 70 West, of the 6th Principal meridian at the location shown on Fig, 1. Preliminary planning for the pro- ject indicates the dam will impound about 2000 acre-feet of water, have a crest length of about 1/2 mile, and a maximum height above the stream bed of about 80 feet. An outlet structure will be located beneath the dam. Our work was performed during the period May 31, 1977, through July, 1977, The object of our work was to determine the general soil and geologic conditions existing within the reservoir, and at the dam site in order to provide preliminary opinions regarding their influence on the design and construction of the dam. The scope of our work was to include a geologic reconnaissance and the drilling of one test boring on the dam axis. Site Description The site is on Bear Creek about one mile downstream from Morrison, Colorado. The reservoir will impound water into an area presently occupied by a few buildings, old gravel pit, and State highway, Vegetation within the reservoir area consists of grass, weeds, brush and trees. Bear Creek in this area has a gradient of about 75 feet per mile and flows in a channel about 50 feet wide. Gravel, cobbles and boulders line the stream bed. A newly constructed 4-lane roadway (not shown on Fig, 1), is present on the north abut- ment, while the south abutment is in a level grassed pasture. A paved access road is present near the north abutment (Old Morrison Road).