Callahan Creek A-1 Reservoir Report
Last Updated: December 19, 2025
Callahan Creek A-1, also known as Callahan Creek Watershed Site A-1 Dam, is a flood risk reduction structure located in Boone County, Missouri.
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Summary
Owned by the local government and designed by USDA NRCS, this earth dam stands at a height of 35 feet and stretches 950 feet in length. Completed in 1979, it serves the primary purpose of flood risk reduction, with a storage capacity of 220 acre-feet and a drainage area of 1523 acres.
The dam, situated on Callahan Creek, has a spillway type of "Uncontrolled" and a hazard potential rated as "High". Despite this, its condition assessment in 2007 was marked as "Satisfactory" and it undergoes inspections every 5 years. With a moderate risk assessment score of 3, the dam is regulated, permitted, inspected, and enforced by the state, ensuring its safety and functionality as a critical piece of infrastructure in the region. For water resource and climate enthusiasts, Callahan Creek A-1 represents a key component in managing flood risks and protecting the surrounding area from potential inundation events.
Year Completed |
1979 |
Dam Length |
950 |
Dam Height |
35 |
River Or Stream |
CALLAHAN CR |
Primary Dam Type |
Earth |
Surface Area |
15 |
Drainage Area |
1523 |
Nid Storage |
220 |
Structural Height |
35 |
Outlet Gates |
None |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
35 |
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.
Callahan Creek A-1