Johnson No. 1 dam
Johnson No. 1
Johnson No. 1, also known as Golden Eye Reservoir, is a private water resource located in Natrona, Wyoming. This reservoir was completed in 1914 and serves primarily for irrigation purposes, with a storage capacity of 12,351 acre-feet and a surface area of 700 acres. The dam, standing at a height of 20 feet, is classified as an Earth dam with a stone core and soil foundation.
Despite its low hazard potential and fair condition assessment, Johnson No. 1 is regulated and inspected by the state of Wyoming, demonstrating a commitment to ensuring its safety and functionality. The reservoir is situated offstream from Middle Casper Creek and is equipped with a slide gate outlet for water release. Its spillway, uncontrolled in type, has a width of 300 feet to manage excess water flow during periods of high rainfall or snowmelt.
With a moderate risk assessment score of 3, Johnson No. 1 remains a vital water source for the region, supporting various purposes such as fire protection, stock, and water supply. Its location in Casper, Wyoming, and its historical significance as a key irrigation infrastructure underscore its importance in managing water resources and mitigating the impacts of climate variability in the area.
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 Johnson No. 1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Deer Creek In Canyon | 49 cfs | → |
| Sweetwater River Near Alcova | 27 cfs | → |
| Middle Fork Powder River Near Barnum | 22 cfs | → |
| Box Elder Creek At Boxelder | 26 cfs | → |
| Powder River At Sussex | 144 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Johnson No. 1.
Boat launches
- Goldeneye Reservoir Boat Ramp
- Chalk Bluffs Boat Ramp
- Whitetail Day Use Area Boat Ramp
- Miles Landing Boat Ramp 2
- Miles Landing Boat Ramp 1
- Trapper Route Road Natrona County
Track Johnson 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 Johnson No. 1
Where does the data for Johnson 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 Johnson No. 1.