Gsd No B-7 (Gc 1-B) Reservoir Report
Last Updated: December 13, 2025
Gsd No B-7 (Gc 1-B) is a vital earth dam located in Atchison, Kansas, completed in 1985 for the primary purpose of flood risk reduction.
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Summary
Designed by the USDA NRCS, this dam stands at a height of 27 feet and spans a length of 655 feet, with a storage capacity of 287 acre-feet. With a low hazard potential and a moderate risk assessment rating, this structure is regulated by the Kansas Department of Agriculture and undergoes regular state inspection, enforcement, and permitting processes to ensure its safety and effectiveness in managing water resources in the region.
Owned and operated by the local government, Gsd No B-7 (Gc 1-B) plays a crucial role in debris control and flood risk reduction within the area. It is situated within the Rock Island District and falls under state jurisdiction, with state-regulated operations and enforcement mechanisms in place to uphold its structural integrity and functionality. Despite not being rated for its condition assessment, this dam serves as a key infrastructure for water resource management in Atchison, Kansas, with a normal storage capacity of 50 acre-feet and a drainage area of 0.76 square miles.
This earth dam, constructed with a buttress core type, features an uncontrolled spillway and no outlet gates, with a spillway width of 40 feet to manage maximum discharges of up to 1259 cubic feet per second. While lacking certain emergency preparedness measures like an Emergency Action Plan (EAP) and inundation maps, Gsd No B-7 (Gc 1-B) remains a significant component of the region's flood control system, serving as a critical structure for water resource and climate enthusiasts to study and monitor in the ongoing management of water-related risks and hazards in the area.
Year Completed |
1985 |
Dam Length |
655 |
Dam Height |
27 |
Primary Dam Type |
Earth |
Surface Area |
10 |
Drainage Area |
0.76 |
Nid Storage |
287 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Delaware R Nr Muscotah
|
34cfs |
Stranger C Nr Potter
|
199cfs |
Missouri River At St. Joseph
|
27600cfs |
Missouri River At Rulo
|
26600cfs |
Big Nemaha River At Falls City
|
310cfs |
Platte River Near Agency
|
77cfs |
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.
Gsd No B-7 (Gc 1-B)