Rocky Branch Creek Watershed Site H-5 Reservoir Report
Last Updated: December 14, 2025
Rocky Branch Creek Watershed Site H-5 is a crucial water resource in Jefferson, Iowa, managed by the local government with oversight from the Iowa Department of Natural Resources.
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Summary
Built in 1958 by the USDA NRCS, this Earth dam serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction. With a maximum storage capacity of 93 acre-feet and a drainage area of 0.49 square miles, the dam plays a vital role in water management in the area.
The dam at Rocky Branch Creek Watershed Site H-5 stands at 26 feet high and spans 489 feet in length, with a spillway type classified as Uncontrolled. Despite being rated as low hazard potential, the risk assessment for this structure is moderate, indicating the need for ongoing monitoring and management. The condition assessment is currently listed as Not Rated, highlighting the importance of regular inspections and maintenance to ensure the safety and effectiveness of this critical infrastructure for water resource management in the region.
With its location in the Rock Island District and proximity to the TR-Rocky Branch Creek, Rocky Branch Creek Watershed Site H-5 plays a significant role in the local ecosystem and water cycle. As climate change continues to impact water resources, it is essential for enthusiasts and stakeholders to be aware of and support the conservation and management efforts for this important watershed site to ensure sustainable water management practices for the future.
Year Completed |
1958 |
Dam Length |
489 |
Dam Height |
26 |
River Or Stream |
TR-ROCKY BRANCH CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
0.49 |
Nid Storage |
93 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
26 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Cedar Creek Near Oakland Mills
|
10cfs |
Big Creek Near Mt. Pleasant
|
0cfs |
Des Moines River At Keosauqua
|
1800cfs |
North Skunk River Near Sigourney
|
97cfs |
English River At Kalona
|
41cfs |
Des Moines River At Ottumwa
|
1090cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Mac Coon Access
|
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Lake Darling State Park Campground
|
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Lake Darling State Park
|
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Round Prairie Park
|
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Brinton Timber
|
Rocky Branch Creek Watershed Site H-5