Shadow Run Dam Reservoir Report

Last Updated: December 5, 2025

Shadow Run Dam, also known as Lake Grady Dam, is a private-owned structure located in Hillsborough, Florida, along Bell Creek.


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Summary

Built in 1969 by the NRCS, this Earth-type dam stands at 30 feet high with a length of 1015 feet, providing a storage capacity of 1870 acre-feet. Its primary purpose is for recreation, specifically for fish and wildlife pond activities. The dam is regulated by the SWFWMD and is subject to state permitting, inspection, and enforcement protocols.

With a significant hazard potential and a very high risk assessment rating, Shadow Run Dam is a crucial piece of infrastructure that requires careful monitoring and maintenance. Despite being deemed as "Not Rated" in terms of condition assessment, the dam underwent structural modifications in 1997 to ensure its continued safety and functionality. As a controlled spillway type, the dam has a maximum discharge capacity of 8309 cubic feet per second, serving a drainage area of 17.43 square miles.

For water resource and climate enthusiasts, Shadow Run Dam presents an intriguing case study of a privately-owned structure playing a vital role in both water management and recreational activities. Its location in the picturesque city of Riverview adds to its allure, making it a focal point for those interested in the intersection of environmental conservation and human leisure. As one of the key elements in the local water infrastructure, the dam serves as a testament to the ongoing efforts to balance the needs of both nature and society in the face of changing climate conditions.

Years Modified

1997 - Structural

Year Completed

1969

Dam Length

1015

Dam Height

30

River Or Stream

BELL CREEK

Primary Dam Type

Earth

Surface Area

120

Drainage Area

17.43

Nid Storage

1870

Structural Height

30

Hazard Potential

Significant

Nid Height

30
       
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.