Summary
Completed in 1957, this earth dam stands at 15 feet tall and stretches 480 feet in length, with a storage capacity of 126 acre-feet. Despite its age, Grandy is in fair condition and is inspected every five years to ensure its integrity and safety.
With a significant hazard potential, Grandy poses a moderate risk due to its location and design. The spillway, an uncontrolled type with a width of 50 feet, helps manage maximum discharges of up to 135 cubic feet per second. The dam's outlet gate consists of a single slide (sluice gate), which aids in regulating water flow and distribution for irrigation purposes.
Managed by the Walla Walla District and falling under Congressional District 00 in Wyoming, Grandy serves as a crucial component in the local water resource infrastructure. Climate and water enthusiasts will appreciate the unique design and purpose of Grandy, highlighting the essential role it plays in supporting agricultural activities in the region.
Year Completed |
1957 |
Dam Length |
480 |
Dam Height |
15 |
River Or Stream |
LITTLE WARM SPRINGS CREEK-OFF |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
10 |
Drainage Area |
9.1 |
Nid Storage |
126 |
Structural Height |
18 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Wind River Near Dubois
|
66cfs |
Wind River Above Red Creek
|
220cfs |
Dinwoody Creek Above Lakes
|
74cfs |
Pine Creek Above Fremont Lake
|
15cfs |
Bull Lake Creek Above Bull Lake
|
47cfs |
Bull Lake Creek Near Lenore
|
831cfs |
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.
Grandy
Warm Springs Creek
Wind River