Ninth Parallel is an earth dam located in Sublette County, Wyoming, built in 1972. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 400 ft long, taller than 55% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Ninth Parallel
The primary purpose of Ninth Parallel is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Twin Eagle Ranch LLC Attn: Cline Trust Co (private). It impounds the Spring Creek near Daniel.
The dam stands 26 feet tall and stretches 400 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 250 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1972, 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 06/24/2025.
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Location
| State | Wyoming |
| County | Sublette |
| Nearest City | Daniel |
| River/Stream | Spring Creek |
| Coordinates | 43.12530, -110.09920 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 25 ft |
| Dam Length | 400 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 250 acre-ft |
| Max Storage | 250 acre-ft |
| Normal Storage | 131 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 489 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Twin Eagle Ranch LLC Attn: Cline Trust Co |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 06/24/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY02103 |
| Federal ID | WY02103 |
| More Info | State Dam Safety Program |