Reynolds No. 1 dam
Reynolds No. 1
Reynolds No. 1 is a privately owned irrigation dam located in Wyoming, specifically in Sheridan County near the city of Wyola, MT. Built in 1972, this earth dam stands at a height of 46 feet and serves the primary purpose of irrigation, with a storage capacity of 889 acre-feet. The dam spans 1000 feet in length and is situated on Twin Creek, under the jurisdiction of the State Engineer's Office.
Despite being classified as having a low hazard potential, Reynolds No. 1 is in poor condition as of its last assessment in 2017. The dam's spillway is uncontrolled, with a width of 15 feet, and it lacks outlet gates. While the risk assessment indicates a moderate level of risk, there are no specific risk management measures identified for this structure. With its location in a picturesque setting and its essential role in providing irrigation water, Reynolds No. 1 is a significant water resource feature that warrants attention and potential improvements to ensure its continued functionality and safety.
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 Reynolds No. 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| East Pass Creek Near Dayton | 12 cfs | → |
| West Pass Creek Near Parkman | 10 cfs | → |
| Tongue River Near Dayton | 48 cfs | → |
| Little Bighorn River At State Line Nr Wyola Mt | 327 cfs | → |
| Tongue River At Monarch | 383 cfs | → |
| Goose Creek Near Acme | 123 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Reynolds No. 1.
Campgrounds
- Tongue Canyon Campground
- Tongue River Camp - Amsden Creek Wma
- Connor Battlefield State Park
- Arrowhead Lodge
- Pine Island Group Campground
- Prune Creek
Fishing spots
- Tongue River Fishing Site
- Tongue River Fishing East
- Tongue River Fishing West
- Sheridan Fairgrounds Pond
- Bighorn Lake
- Upper Paintrock Fishing Site
Paddle runs
- Bridge At Tongue River Canyon To Burgess Picnic Grounds
- Sf Tongue- Johnson Creek To Confluence With Nf Tongue
- Wagon Box Creek To Dry Fork Trail
- Dry Fork River From Its Confluence With Lake Creek To Confluence With Little Big Horn
- Nf Tongue From Burgess Picnic Ground To Pole Creek
- Fools Gold Crossing (Fdr 480) To Wagon Box Creek
Track Reynolds 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 Reynolds No. 1
Where does the data for Reynolds 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 Reynolds No. 1.