Mulligan is an earth dam located in Weld County, Colorado, built in 1878. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 700 ft long. 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 Mulligan
The primary purpose of Mulligan is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mulligan Lake Estates Homeowners Association (alyc (private). It impounds the St. Vrain Creek-os near Platteville.
The dam stands 10 feet tall and stretches 700 feet across, creates a reservoir covering 13 acres, and has a maximum storage capacity of 84 acre-feet. Completed in 1878, 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 11/03/1999. That was over 26 years ago.
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Location
| State | Colorado |
| County | Weld |
| Nearest City | Platteville |
| River/Stream | St. Vrain Creek-os |
| Coordinates | 40.22168, -104.99390 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 700 ft |
| Year Completed | 1878 (148 years old) |
Storage & Hydraulics
| NID Storage | 84 acre-ft |
| Max Storage | 84 acre-ft |
| Normal Storage | 51 acre-ft |
| Surface Area | 13 acres |
| Max Discharge | 193 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Mulligan Lake Estates Homeowners Association (alyc |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 11/03/1999 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01235 |
| Federal ID | CO01235 |
| More Info | State Dam Safety Program |