Thayer No. 1 dam
Thayer No. 1
Thayer No. 1 is a privately owned earth dam located in Park, Wyoming, specifically on the Greybull River off Carter Mountain. Completed in 1935, this irrigation structure stands 13 feet tall and has a hydraulic height of 7 feet, with a length of 120 feet. It has a storage capacity of 69 acre-feet and a surface area of 17 acres, serving the purpose of irrigation for the surrounding area.
Despite its age, Thayer No. 1 has a low hazard potential and is currently in fair condition, as assessed during the last inspection in September 2019. The dam is under state jurisdiction and regulation, with permitting, inspection, and enforcement processes in place through the State Engineer's Office. In the event of an emergency, the dam has one valve outlet gate and an uncontrolled spillway with a width of 40 feet.
Thayer No. 1 poses a moderate risk level, but with proper risk management measures in place, it continues to provide essential irrigation functions for the region. As water resource and climate enthusiasts, understanding and monitoring the condition of dams like Thayer No. 1 is crucial for ensuring the safety and sustainability of our water infrastructure.
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 Thayer No. 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| South Fork Shoshone River Near Valley | 176 cfs | → |
| South Fork Shoshone River Ab Buffalo Bill Res | 896 cfs | → |
| Greybull River At Meeteetse | 338 cfs | → |
| North Fork Shoshone River At Wapiti | 2,760 cfs | → |
| Shoshone River Below Buffalo Bill Reservoir | 315 cfs | → |
| Cottonwood C At High Island Rnch Nr Hamilton Dome | 1 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Thayer No. 1.
Boat launches
Campgrounds
- Bobcat-Houlihan Lower Camping Area
- Bobcat-Houlihan Upper Camping Area
- Bobcat-Houlihan Recreation Area
- Brown Mountain
- Brown Mountain Campground
- Wood River
Track Thayer No. 1 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 Thayer No. 1
Where does the data for Thayer No. 1 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 Low 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 Thayer No. 1.