Clark No. 1 dam
Clark No. 1
Clark No. 1, located in Niobrara, Wyoming, is a privately-owned earth dam constructed in 1959 for irrigation purposes along ALUM CREEK. Standing at 25 feet high with a spillway width of 250 feet, this structure has a storage capacity of 496 acre-feet and a surface area of 39 acres. Despite its low hazard potential, the dam's condition assessment in 2019 rated as poor, highlighting the need for maintenance and potential improvements to ensure its long-term stability.
Managed by the SEO agency in Wyoming, Clark No. 1 is subject to state regulation, permitting, inspection, and enforcement. The dam's last inspection in November 2019 revealed its poor condition, prompting a moderate risk assessment and raising concerns about its structural integrity. The presence of an uncontrolled spillway and a single valve for outlet gates further underscores the importance of regular monitoring and maintenance to mitigate potential risks associated with the dam.
With Liz Cheney (R) representing the Congressional District 00 in Wyoming, stakeholders involved in water resource management and climate adaptation should closely monitor the condition of Clark No. 1. As climate change continues to impact water availability and infrastructure resilience, ensuring the safety and functionality of dams like Clark No. 1 is crucial for sustainable water management and agricultural practices in the region. Collaborative efforts between private owners, regulatory agencies, and local communities will be essential in addressing the dam's poor condition and implementing risk management measures to protect surrounding areas from potential hazards.
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 Clark No. 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Cheyenne River Near Spencer | 2 cfs | → |
| Cheyenne R At Edgemont Sd | 5 cfs | → |
| Hat Cr Near Edgemont Sd | 0 cfs | → |
| Cheyenne R Below Angostura Dam Sd | 1 cfs | → |
| Fall R At Hot Springs Sd | 37 cfs | → |
| Stockade Beaver Creek Near Newcastle | 18 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Clark No. 1.
Paddle runs
Track Clark 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 Clark No. 1
Where does the data for Clark 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 Clark No. 1.