Spencerport Waste Weir Dam Reservoir Report

Last Updated: December 5, 2025

Spencerport Waste Weir Dam, located in Monroe, New York, is a concrete structure completed in 1918 for the primary purpose of navigation along the TR-Northup Creek.


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Summary

With a height of 17 feet and a length of 92 feet, the dam boasts a storage capacity of 10,488 acre-feet and a maximum discharge of 1,151 cubic feet per second. The dam's spillway, measuring 50 feet in width, is of the uncontrolled type, posing a high hazard potential.

Managed by the state of New York's Department of Environmental Conservation, Spencerport Waste Weir Dam is subject to regular inspections, with the last one conducted in September 2020. Despite being rated as not assessed for condition, the dam is categorized as having a moderate risk level. With a drainage area of 1.6 square miles and a normal storage capacity of 8,640 acre-feet, the dam plays a crucial role in water resource management in the region.

Water resource and climate enthusiasts will find Spencerport Waste Weir Dam an intriguing structure due to its historical significance and importance in facilitating navigation along the TR-Northup Creek. As a state-regulated facility with high hazard potential, the dam's management and maintenance are vital to ensuring public safety and efficient water flow in the area. Its moderate risk level underscores the need for ongoing monitoring and risk management measures to safeguard both the dam's integrity and the surrounding environment.

Year Completed

1918

Dam Length

92

Dam Height

17

River Or Stream

TR-Northup Creek

Primary Dam Type

Concrete

Surface Area

890

Drainage Area

1.6

Nid Storage

10488

Hazard Potential

High

Nid Height

17
       
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.