Collie Dam Reservoir Report
Nearby: Tate Dam Thorton Dam
Last Updated: December 6, 2025
Collie Dam, located in Pittsylvania, Virginia, is a private-owned structure primarily used for irrigation purposes.
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Summary
With a height of 27 feet and a length of 460 feet, this earth dam sits on Grassy Branch and has a storage capacity of 41 acre-feet. The dam is regulated by the Department of Conservation and Recreation, making it subject to state jurisdiction, permitting, inspection, and enforcement.
Despite its undetermined hazard potential and unrated condition assessment, Collie Dam remains a crucial water resource in the region. Its strategic location and design allow for efficient water storage and distribution for agricultural purposes. The dam's presence ensures a reliable water supply for the surrounding area, contributing to the sustainability of local ecosystems and communities. As climate change continues to impact water resources, structures like Collie Dam play a vital role in managing and optimizing water usage in the face of evolving environmental conditions.
Dam Length |
460 |
Dam Height |
27 |
River Or Stream |
Grassy branch |
Primary Dam Type |
Earth |
Surface Area |
3.1 |
Hydraulic Height |
27 |
Nid Storage |
41 |
Structural Height |
27 |
Hazard Potential |
Undetermined |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dan River At Stp Near Danville
|
979cfs |
Dan River At Paces
|
1160cfs |
Sandy River Near Danville
|
38cfs |
Hyco R Bl Abay D Nr Mcgehees Mill
|
1cfs |
Hyco Creek Near Leasburg
|
5cfs |
Pigg River Near Sandy Level
|
112cfs |
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.
Collie Dam