Armstrong Lagoon Reservoir Report
Nearby: Ricks Lake Dam Cooper Lake Dam
Last Updated: December 5, 2025
Armstrong Lagoon, located in Nash, North Carolina, is a privately owned water resource with a significant hydraulic height of 13.7 feet and a structural height of 15.2 feet.
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Summary
This earth dam stands at a height of 15 feet and spans a length of 770 feet, creating a storage capacity of 48 acre-feet and covering a surface area of 3.2 acres. Although its last inspection dates back to March 2004, this dam is classified as having a "Significant" hazard potential, although its condition is currently "Not Rated".
Situated on Swift Cr Trib, Armstrong Lagoon serves a primary purpose of "Other" and is not regulated by the state, nor does it require permitting. This structure, owned and operated privately, plays a crucial role in managing water resources and climate impact mitigation in the area. With its proximity to Wilmington District and significant storage capacity, this lagoon is a key feature in the local water infrastructure. Although lacking recent updates and risk assessments, Armstrong Lagoon remains a valuable asset for water resource and climate enthusiasts in the region.
Dam Length |
770 |
River Or Stream |
Swift Cr Trib |
Primary Dam Type |
Earth |
Surface Area |
3.2 |
Hydraulic Height |
13.7 |
Nid Storage |
48 |
Structural Height |
15.2 |
Hazard Potential |
Significant |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Swift Creek At Hilliardston
|
858cfs |
Little Fishing Creek Near White Oak
|
13cfs |
Fishing Creek Near Enfield
|
129cfs |
Tar River At Nc 97 At Rocky Mount
|
240cfs |
Tar R At Us 401 At Louisburg
|
97cfs |
Tar River At Tarboro
|
418cfs |
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.
Armstrong Lagoon