Summary
Built in 1959 by designer Floyd A Bishop, this earth dam stands at a height of 32 feet and has a storage capacity of 228 acre-feet. With a spillway width of 42 feet and a slide gate for outlet control, Johnson serves the primary purpose of agricultural irrigation for the surrounding area.
Despite being classified as having a low hazard potential and fair condition assessment, Johnson has undergone regular inspections every five years to ensure its safety and functionality. The dam, which is regulated and permitted by the State of Wyoming, is equipped with measures to manage moderate risks associated with its operation. Located in a picturesque setting with a surface area of 17 acres, Johnson plays a crucial role in water resource management in the region.
With Liz Cheney (R) as the Congressional representative for the area, Johnson continues to be an important structure for water distribution and agricultural support. Its presence on Twin Creek contributes to the overall water management system in the region, highlighting the intersection of water resources and climate considerations in sustaining agricultural activities in Wyoming.
Year Completed |
1959 |
Dam Length |
355 |
Dam Height |
32 |
River Or Stream |
TWIN CREEK |
Primary Dam Type |
Earth |
Surface Area |
17 |
Hydraulic Height |
27 |
Nid Storage |
228 |
Structural Height |
32 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
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. Investigations and studies are necessary.
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.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams 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, environment 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.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Johnson
Little Popo Agie River