St. Joe Tailings is an other dam located in Boulder County, Colorado, built in 1936. It carries a Low hazard potential classification.
Dam profile
NID height · 42 ft42 ft tall and 1,230 ft long, taller than 88% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About St. Joe Tailings
The primary purpose of St. Joe Tailings is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by City of Boulder, Public Works (boyes, Bill) (local government). It impounds the Boulder Creek-os near Boulder.
The dam stands 42 feet tall and stretches 1,230 feet across, creates a reservoir covering 16 acres, and has a maximum storage capacity of 99 acre-feet. Completed in 1936, the structure is well-established, with more than 75 years of service.
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 09/25/2013. That was over 13 years ago.
At 42 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Colorado |
| County | Boulder |
| Nearest City | Boulder |
| River/Stream | Boulder Creek-os |
| Coordinates | 40.03052, -105.20221 |
Physical Characteristics
| Dam Type | Other |
| NID Height | 42 ft |
| Dam Height | 37 ft |
| Dam Length | 1,230 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 99 acre-ft |
| Max Storage | 99 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 16 acres |
| Max Discharge | 1,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Tailings |
| Owner | City of Boulder, Public Works (boyes, Bill) |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/25/2013 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO00252 |
| Federal ID | CO00252 |
| More Info | State Dam Safety Program |