Grymes Mill Dam Reservoir Report
Nearby: Northrup Dam Spring Vale Dam
Last Updated: January 11, 2026
Grymes Mill Dam, located in Orange, Virginia, is a privately owned earth dam on Church Run with a primary purpose of recreation.
°F
°F
mph
Wind
%
Humidity
Summary
The dam stands at 30 feet high and stretches 120 feet in length, with a storage capacity of 1207 acre-feet and a surface area of 55 acres. Despite being state-regulated and inspected, the dam's condition assessment remains unrated since its last inspection in December 2008. With a low hazard potential, Grymes Mill Dam poses minimal risk to the surrounding area.
While the dam has not been modified in recent years, its emergency action plan (EAP) was last revised in December 2002. The dam's emergency preparedness and risk management measures, including inundation maps and risk assessment, are currently not specified in the available data. The dam is not under the jurisdiction of the US Army Corps of Engineers and has no associated federal agency ownership, funding, design, construction, or regulatory oversight. Despite its low hazard potential, Grymes Mill Dam serves as a recreational asset in Orange County, providing opportunities for outdoor activities in a scenic natural setting.
Dam Length |
120 |
Dam Height |
30 |
River Or Stream |
Church Run |
Primary Dam Type |
Earth |
Surface Area |
55 |
Hydraulic Height |
30 |
Drainage Area |
4.5 |
Nid Storage |
1207 |
Structural Height |
30 |
Hazard Potential |
Low |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Robinson River Near Locust Dale
|
260cfs |
Rapidan River Near Culpeper
|
147cfs |
Rapidan River Near Ruckersville
|
114cfs |
N F Rivanna River Near Earlysville
|
153cfs |
Rappahannock River At Remington
|
239cfs |
North Anna River Near Partlow
|
46cfs |
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.
Grymes Mill Dam