Grant Lake Reservoir Report
Nearby: Pickell Lake Dave Jones Catfish Ponds
Last Updated: December 6, 2025
Grant Lake, located in Isola, Mississippi, is a privately owned water resource managed by the USDA NRCS.
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Summary
Constructed in 1977, this earth dam stands at 8 feet tall and spans 7,920 feet in length, with a storage capacity of 480 acre-feet. The dam's primary purpose is categorized as "Other," with a low hazard potential and moderate risk assessment rating.
Despite being non-federally regulated, Grant Lake boasts an uncontrolled spillway and outlet gates, with a maximum discharge of 14 cubic feet per second. The surrounding Bock Bayou - Os stream contributes to the lake's drainage area, while its condition remains unrated. With its strategic location and historical significance as a water resource, Grant Lake serves as a notable example of sustainable water management practices in the region.
Year Completed |
1977 |
Dam Length |
7920 |
Dam Height |
8 |
River Or Stream |
BOCK BAYOU -OS |
Primary Dam Type |
Earth |
Hydraulic Height |
8 |
Nid Storage |
480 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Bogue Phalia Nr Leland
|
1110cfs |
Big Sunflower River At Sunflower
|
1370cfs |
Abiaca Creek At Cruger
|
44cfs |
Harland Creek Nr Howard
|
3340cfs |
Bayou Macon At Eudora
|
48cfs |
Bayou Macon Nr Kilbourne
|
132cfs |
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.
Grant Lake