Gray Reef Dam
Gray Reef Dam is an earth dam located in Natrona County, Wyoming, built in 1961. It carries a Low hazard potential classification.
About Gray Reef Dam
The primary purpose of Gray Reef Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Bureau Of Reclamation (federal). It impounds the North Plate River near Casper.
The dam stands 38 feet tall and stretches 650 feet across, creates a reservoir covering 182 acres, has a maximum storage capacity of 1,804 acre-feet, and collects water from a drainage area of 10,768 square miles. Completed in 1961, the structure is well into its service life at over 50 years 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 07/26/2023.
At 38 feet, this dam is taller than 85% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Wyoming |
| County | Natrona |
| Nearest City | Casper |
| River/Stream | North Plate River |
| Coordinates | 42.56540, -106.70150 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 650 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 1,804 acre-ft |
| Max Storage | 1,804 acre-ft |
| Normal Storage | 1,804 acre-ft |
| Surface Area | 182 acres |
| Drainage Area | 10,768 sq mi |
| Max Discharge | 20,700 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | BUREAU OF RECLAMATION |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not Available |
| Last Inspection | 07/26/2023 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01292 |
| Federal ID | WY01292 |
| More Info | State Dam Safety Program |