Glen Raven Altamahaw Reservoir Report
Nearby: Apple Dam Ravenwood Dam
Last Updated: December 13, 2025
Located in Alamance, North Carolina, Glen Raven Altamahaw, also known as Ossipee, is a private hydroelectric dam situated on the Haw River.
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Summary
With a hydraulic height of 17.5 feet and a structural height of 17 feet, this masonry dam has a length of 590 feet and provides a storage capacity of 3062 acre-feet. Despite not being state-regulated, the dam is inspected regularly for safety and maintenance purposes, with the last inspection conducted in November 2015.
The primary purpose of Glen Raven Altamahaw is hydroelectric power generation, making it an essential source of renewable energy in the region. With a low hazard potential and a current condition assessment of "Not Rated", the dam is still operational and plays a crucial role in water resource management along the Haw River. While lacking detailed information on its construction date and other structural features, the dam's presence underscores the intersection between water resources and climate considerations in the area.
As part of the Wilmington District of the US Army Corps of Engineers, Glen Raven Altamahaw contributes to the sustainable development of the region by harnessing the power of the Haw River for clean energy production. Its strategic location and efficient design make it a valuable asset for water resource and climate enthusiasts interested in the intersection of hydroelectric power generation and environmental stewardship. Further research and monitoring of this dam could provide valuable insights into its long-term impact on the surrounding ecosystem and water management efforts in North Carolina.
Dam Length |
590 |
River Or Stream |
Haw River |
Primary Dam Type |
Masonry |
Surface Area |
25 |
Hydraulic Height |
17.5 |
Nid Storage |
3062 |
Structural Height |
17 |
Hazard Potential |
Low |
Nid Height |
18 |
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.
Glen Raven Altamahaw
Haw River Trail Alamance County