Panama No. 1 - Northwest
Panama No. 1 - Northwest is a rockfill dam located in Boulder County, Colorado, built in 1904. It carries a Low hazard potential classification.
About Panama No. 1 - Northwest
The primary purpose of Panama No. 1 - Northwest is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Boulder & White Rock Ditch & Reservoir Co. (grant, (private). It impounds the Boulder Creek-os near Evans.
The dam stands 7 feet tall and stretches 1,900 feet across, creates a reservoir covering 370 acres, has a maximum storage capacity of 6,979 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1904, 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 07/22/2021.
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Location
| State | Colorado |
| County | Boulder |
| Nearest City | Evans |
| River/Stream | Boulder Creek-os |
| Coordinates | 40.10056, -105.08973 |
Physical Characteristics
| Dam Type | Rockfill |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 1,900 ft |
| Year Completed | 1904 (122 years old) |
Storage & Hydraulics
| NID Storage | 6,979 acre-ft |
| Max Storage | 6,979 acre-ft |
| Normal Storage | 4,691 acre-ft |
| Surface Area | 370 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 4,150 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BOULDER & WHITE ROCK DITCH & RESERVOIR CO. (GRANT, |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 07/22/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO02823 |
| Federal ID | CO02823 |
| More Info | State Dam Safety Program |