Arnold
Arnold is an earth dam located in Goshen County, Wyoming, built in 1968. It carries a Low hazard potential classification and has a fair condition assessment.
About Arnold
The primary purpose of Arnold is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Gregg D. Jones Et Al (private). It impounds the North Platte Offstream near Morrill, Nebraska.
The dam stands 33 feet tall and stretches 300 feet across, creates a reservoir covering 227 acres, and has a maximum storage capacity of 2,639 acre-feet. Completed in 1968, 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. 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 05/01/2020.
At 33 feet, this dam is taller than 78% of dams nationwide.
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Location
| State | Wyoming |
| County | Goshen |
| Nearest City | Morrill, Nebraska |
| River/Stream | North Platte Offstream |
| Coordinates | 42.07920, -104.14390 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 300 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 2,639 acre-ft |
| Max Storage | 2,639 acre-ft |
| Normal Storage | 1,134 acre-ft |
| Surface Area | 227 acres |
| Max Discharge | 499 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Gregg D. Jones et al |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 05/01/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY00274 |
| Federal ID | WY00274 |
| More Info | State Dam Safety Program |