Crystal
Crystal is an earth dam located in Boulder County, Colorado, built in 1881. It carries a Low hazard potential classification.
About Crystal
The primary purpose of Crystal is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Harvey Yoakum, (private). It impounds the St. Vrain Creek-os near Longmont.
The dam stands 11 feet tall and stretches 1,140 feet across, creates a reservoir covering 35 acres, and has a maximum storage capacity of 290 acre-feet. Completed in 1881, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 06/22/2017.
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Location
| State | Colorado |
| County | Boulder |
| Nearest City | Longmont |
| River/Stream | St. Vrain Creek-os |
| Coordinates | 40.24184, -105.13713 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 1,140 ft |
| Year Completed | 1881 (145 years old) |
Storage & Hydraulics
| NID Storage | 290 acre-ft |
| Max Storage | 290 acre-ft |
| Normal Storage | 178 acre-ft |
| Surface Area | 35 acres |
| Max Discharge | 400 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | HARVEY YOAKUM, |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 06/22/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO00857 |
| Federal ID | CO00857 |
| More Info | State Dam Safety Program |