John Morgan Dam Reservoir Report
Nearby: Kleinpeter Dairy Dam Hollands Pond
Last Updated: January 12, 2026
John Morgan Dam, located in Montpelier, Louisiana, is a privately owned structure with a primary purpose of recreation.
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Summary
This earth dam spans 500 feet in length and stands at a height of 10 feet, with a maximum storage capacity of 50 acre-feet. The dam regulates the flow of the Hog Branch river, and its spillway, with a width of 50 feet, is of the uncontrolled type.
Despite being classified as having a low hazard potential, the dam's condition assessment is currently unsatisfactory, as of the last inspection in November 2018. The risk assessment for John Morgan Dam is moderate, with a DSAC assigned date yet to be determined. While the dam has not been modified in recent years, it is subject to regular inspections and regulatory oversight by the Louisiana Department of Transportation and Development.
Water resource and climate enthusiasts may be drawn to John Morgan Dam for its role in providing recreational opportunities in the St. Helena County area. As a key structure in managing water resources and preventing potential flooding, ongoing monitoring and maintenance are essential to ensure the dam's safety and effectiveness in the face of changing environmental conditions.
Dam Length |
500 |
Dam Height |
10 |
River Or Stream |
HOG BRANCH |
Primary Dam Type |
Earth |
Surface Area |
9.7 |
Hydraulic Height |
10 |
Drainage Area |
2 |
Nid Storage |
50 |
Structural Height |
10 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Tickfaw River At Holden
|
1430cfs |
Natalbany River At Baptist
|
555cfs |
Tickfaw River At Liverpool
|
4680cfs |
Amite River Near Darlington
|
10100cfs |
Tangipahoa River At Robert
|
3320cfs |
Comite River Near Olive Branch
|
65cfs |
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.
John Morgan Dam