Coal Ridge Waste Dam #1
Coal Ridge Waste Dam #1 is an earth dam located in Weld County, Colorado, built in 1954. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Coal Ridge Waste Dam #1
The primary purpose of Coal Ridge Waste Dam #1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Platte Valley Irrigation Co. (schmidt, Kevin) (private). It impounds the South Platte River-os near Platteville.
The dam stands 31 feet tall and stretches 2,720 feet across, creates a reservoir covering 81 acres, has a maximum storage capacity of 1,189 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1954, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/23/2022.
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Location
| State | Colorado |
| County | Weld |
| Nearest City | Platteville |
| River/Stream | South Platte River-os |
| Coordinates | 40.11612, -104.84559 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 2,720 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 1,189 acre-ft |
| Max Storage | 1,189 acre-ft |
| Normal Storage | 591 acre-ft |
| Surface Area | 81 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 9,290 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | PLATTE VALLEY IRRIGATION CO. (SCHMIDT, KEVIN) |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/23/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO00090 |
| Federal ID | CO00090 |
| More Info | State Dam Safety Program |