Greybull Valley (1st Enl.) dam
Greybull Valley (1st Enl.)
Greybull Valley (1st Enl.), also known as Roach Gulch, is a private irrigation structure located in Park, Wyoming. Managed by States West, this earth dam stands at a height of 207 feet and was completed in 2000 for the primary purpose of irrigation. With a storage capacity of 53,200 acre-feet and a drainage area of 11.7 square miles, the dam serves as a vital resource for water management in the region.
This high-hazard dam on Red Clay Draw has a fair condition assessment as of August 2019, with a moderate risk rating. Despite its controlled spillway and outlet gates, the dam's hazard potential is classified as high. Regular inspections and enforcement by the State of Wyoming help ensure the safety and integrity of the structure, with a 5-year inspection frequency in place. The Congressman representing the area is Liz Cheney (R), under Congressional District 00.
With its strategic location and crucial role in irrigation and recreation, Greybull Valley (1st Enl.) serves as a key water resource in the region. Its impact on the local ecosystem and community highlights the importance of sustainable water management practices and ongoing monitoring to mitigate potential risks and ensure the long-term resilience of the dam and surrounding areas.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Greybull Valley (1st Enl.) -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Greybull River At Meeteetse | 338 cfs | → |
| Shoshone River Below Buffalo Bill Reservoir | 315 cfs | → |
| Bighorn River At Basin | 1,590 cfs | → |
| South Fork Shoshone River Ab Buffalo Bill Res | 1,250 cfs | → |
| Shoshone River Near Lovell | 371 cfs | → |
| Bighorn River At Kane | 2,120 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Greybull Valley (1st Enl.).
Boat launches
Fishing spots
- Sunshine Lake (Lower)
- Newton Lakes
- Sunshine Reservoir (Upper)
- Buffalo Bill Reservoir
- Big Horn Lake
- Bridger Bend
Paddle runs
Track Greybull Valley (1st Enl.) in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Greybull Valley (1st Enl.)
Where does the data for Greybull Valley (1st Enl.) come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the High hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Greybull Valley (1st Enl.).