Law, John
Law, John is an earth dam located in Weld County, Colorado, built in 1896. It carries a Low hazard potential classification and has a fair condition assessment.
About Law, John
The primary purpose of Law, John is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Loup Reservoir Co. (private). It impounds the Slough near Windsor.
The dam stands 14 feet tall and stretches 500 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 310 acre-feet, and collects water from a drainage area of 36 square miles. Completed in 1896, 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 06/21/2022.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Colorado |
| County | Weld |
| Nearest City | Windsor |
| River/Stream | Slough |
| Coordinates | 40.51412, -104.85269 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 500 ft |
| Year Completed | 1896 (130 years old) |
Storage & Hydraulics
| NID Storage | 310 acre-ft |
| Max Storage | 310 acre-ft |
| Normal Storage | 36 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 36 sq mi |
| Max Discharge | 310 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | LOUP RESERVOIR CO. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/21/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | CO01172 |
| Federal ID | CO01172 |
| More Info | State Dam Safety Program |