Anthonys Mill Reservoir Report

Last Updated: December 6, 2025

Anthonys Mill, located in Upper Tulpehocken Township, Pennsylvania, is a privately-owned dam built in 1927 primarily for recreational purposes.


°F

°F

mph

Wind

%

Humidity

Summary

Standing at a height of 15 feet and spanning 110 feet in length, this arch-type structure holds a normal storage capacity of 10.7 acre-feet and a maximum storage of 12 acre-feet. Situated on Jackson Creek, the dam covers a surface area of 4 acres and serves a drainage area of 2 square miles.

Despite its fair condition assessment, Anthonys Mill poses a significant hazard potential and is regulated by the Pennsylvania Department of Environmental Protection. The dam undergoes inspections every two years, with the last assessment conducted in June 2017. While the risk assessment and emergency action plan status remain unspecified, the dam's associated risk management measures and inundation maps are yet to be prepared or updated.

Enthusiasts of water resources and climate will find Anthonys Mill to be an intriguing structure due to its historical significance, recreational purpose, and the potential risks it poses. With its unique design and location on Jackson Creek, this dam serves as a reminder of the intersection between human infrastructure and natural water systems in the Pennsylvania landscape. Understanding its condition, regulatory oversight, and emergency preparedness measures can provide valuable insights into the management of water resources in the region.

Year Completed

1927

Dam Length

110

Dam Height

15

River Or Stream

JACKSON CREEK

Primary Dam Type

Arch

Surface Area

4

Drainage Area

2

Nid Storage

12

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

15
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.