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I . . I . I I I . I I I I I . I I '. , I II-3 B. History The urbanization of the Hidden Lake Planning Basin above or west of Hidden Lake has occurred within the last fifteen years. The area in Adams County, centered around the intersection of 64th Avenue and Lowell Blvd., apparently developed just prior and subsequent to the Second World War (1940-1955). The numerous ponds that are located within the Clear Creek alluvial terrace area, such as the Crestview Water and Sanitation District ponds, Lake Sangraco (Brannan) and the Aloha Beach ponds, were excavated by sand and gravel extraction operations during the late 1950's and early 1960's. Prior to that time, the Clear Creek terrace area was farmed to truck garden or high-value horticulture crops. Hidden Lake appears to be located on the site of a natural pond or swampy area. The dam impounding the water to the present level was originally constructed during the 1890 decade and is approximately eight to ten feet high. A filing by the Westminster Resort Reservoir and Irrigation Company in 1907 indicated plans to enlarge the reservoir to over 3400 acre-feet of storage with a total dam height of 24 feet. This filing was apparently never implemented. A series of drawings setting forth certain improvements to the dam and spillway were filed with the Colorado State Engineer's Office in 1958 and again this work was apparently not completed. The dam, in its present configuration, has a nominal crest elevation of 5281.5 feet. A simple broadcrest, uncontrolled spillway is located in the left (north) abutment area. The crest of the spillway is at elevation 5280.5 feet, which provides only one foot of freeboard. A makeshift installation of flashboards or planks have been installed in a contraction joint in the spillway,