Del-Co Upland Storage Reservoir No. 3 Reservoir Report

Last Updated: December 5, 2025

Del-Co Upland Storage Reservoir No.


°F

°F

mph

Wind

%

Humidity

Summary

3, located in Mount Air, Ohio, is a vital water resource infrastructure designed by BBC&M Engineering Inc. The reservoir, completed in 1994, serves as a key water supply source for the region, with a storage capacity of 774 acre-feet and a surface area of 29.3 acres. Situated along the Olentangy River, this offstream reservoir plays a crucial role in water management for Delaware County.

With a dam height of 51 feet and a length of 4490 feet, Del-Co Upland Storage Reservoir No. 3 is regulated and inspected by the Department of Natural Resources in Ohio. The reservoir has a high hazard potential but is currently assessed to be in fair condition, with the last inspection conducted in July 2018. Despite its age, the reservoir continues to fulfill its primary purpose of providing water supply to the community, with a normal storage capacity of 638 acre-feet and a maximum discharge of 23 cubic feet per second. As a public utility-owned structure, this reservoir plays a crucial role in water resource management and climate resilience efforts in the region.

Year Completed

1994

Dam Length

4490

Dam Height

51

River Or Stream

OLENTANGY RIVER - OFFSTREAM

Primary Dam Type

Earth

Surface Area

29.3

Drainage Area

0.05

Nid Storage

774

Hazard Potential

High

Nid Height

51
       
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.