Colorado. Case Study. PL566 Remedial Assistance Project. Frank Riggle Colorado Assistant State Conservationist Water Resources. The Dam. Built with PL-566 in 1971 Flood Control Crest to reservoir: 30’ Structural Height: 70’ Structure length: 490’. Holes. Intelligent Rodents???.
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Frank RiggleColorado Assistant State ConservationistWater Resources
The Colorado State Engineer issued the sponsors a breach order in March 2004Breach Order
½” – 3” diameter holes became evident in early 1980’s, and are considerably larger today
View of embankment with sink hole in foreground, shows developing pattern of holes along crest.