Enl. Rocky Road Reservoir Report
Nearby: Boulder Lane Rough Ride
Last Updated: December 5, 2025
Enl.
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Summary
Rocky Road, located in Johnson, Wyoming, is a privately owned Earth dam built in 2007 for irrigation purposes along the Larry Draw river. Standing at a height of 32 feet and with a hydraulic height of 26 feet, this dam has a storage capacity of 65 acre-feet and covers a surface area of 4 acres. With a spillway width of 155 feet and a maximum discharge capacity of 2118 cubic feet per second, it serves as a vital source for fire protection, stock, and small fish ponds in the area.
Despite its fair condition assessment and low hazard potential, Enl. Rocky Road is subject to regular inspections every five years to ensure its structural integrity and functionality. The dam features a valve outlet gate for water release and has a risk assessment rating of moderate (3). Although it has not been modified in recent years, the dam remains under state regulation and inspection by the Wyoming State Engineer's Office, highlighting the importance of proper maintenance and risk management measures to safeguard water resources and the surrounding environment.
Enl. Rocky Road serves as a crucial water resource infrastructure in the region, contributing to irrigation activities and providing essential water storage capacity. With its strategic location and functional design, this dam plays a significant role in supporting agricultural activities and ensuring water availability for various purposes. As an integral part of the local water management system, Enl. Rocky Road underscores the importance of sustainable water resource management practices and proactive risk assessment to minimize potential hazards and ensure the resilience of water infrastructure in the face of changing climate conditions.
Year Completed |
2007 |
Dam Length |
590 |
Dam Height |
32 |
River Or Stream |
LARRY DRAW |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
26 |
Nid Storage |
65 |
Structural Height |
34 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Powder River At Arvada
|
156cfs |
Wild Horse Creek Near Arvada
|
0cfs |
Clear Creek Near Buffalo
|
12cfs |
Piney Creek At Kearny
|
113cfs |
Rock Creek Near Buffalo
|
70cfs |
Clear Creek Near Arvada
|
256cfs |
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.
Enl. Rocky Road