Flagstone dam
Flagstone
Flagstone is a federal-owned dam located in Washakie, Wyoming, with a primary purpose of providing fire protection, stock, or a small fish pond. Built in 1965 by designer Walter J Pilch, the dam is an earth structure with a core made of stone and a foundation of soil. Standing at a height of 27 feet and spanning 248 feet in length, Flagstone has a storage capacity of 48 acre-feet and a surface area of 4 acres.
Despite being categorized as having a low hazard potential and fair condition assessment, Flagstone is regulated and inspected by the State of Wyoming to ensure its safety and compliance. The dam is equipped with an uncontrolled spillway, with a spillway width of 30 feet. Although the drainage area associated with the dam is listed as 0, the dam serves as a crucial resource for water management and agricultural purposes in the region. As climate change continues to impact water resources, the management and upkeep of dams like Flagstone become increasingly important for sustainable water use and environmental protection.
In the event of an emergency, the dam has protocols in place for risk management and emergency response, with inspections occurring every 5 years to assess its condition and readiness. With its moderate risk assessment and location in an area prone to natural disasters, Flagstone serves as a vital infrastructure for water supply and ecosystem support, highlighting the intersection of water resource management and climate resilience in the face of changing environmental conditions.
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 Flagstone -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| North Fork Powder River Near Hazelton | 3 cfs | → |
| Bighorn R At Worland Wyo | 4,350 cfs | → |
| Nf Powder River Below Pass Creek | 50 cfs | → |
| Middle Fork Powder River Near Barnum | 27 cfs | → |
| Shell Creek Above Shell Creek Reservoir | 12 cfs | → |
| Bighorn River At Basin | 1,010 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Flagstone.
Campgrounds
- Castle Gardens Scenic Area Campsite 1
- Castle Gardens Scenic Area Campsite 2
- Castle Gardens Scenic Area Campground
- Castle Gardens Scenic Area Campsite 3
- Leigh Creek Campground
- Leigh Creek
Fishing spots
- Veterans Cove Fishing Site
- Upper Paintrock Fishing Site
- Tie Hack Reservoir
- Lake Desmet
- Healy Lake
- Tongue River Fishing West
Paddle runs
Track Flagstone 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 Flagstone
Where does the data for Flagstone 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 Flagstone.