Upper South Dam Quick Facts
Upper South Dam Map
Upper South Dam Information
Upper South Dam is a gravity earth dam located about 8 miles from Lachine, Alpena, Michigan.
The dam, which is on the Thunder Bay River, was primarily built for Hydroelectric purposes, but also serves for Recreation benefits.
The dam was designed by and commissioned in 1930 and is currently owned by .
Upper South Dam Structure
The Upper South Dam is approximately 350 feet (107 m) long, 20 feet (6 m) high and has a structural volume of cubic yards (0 cubic metres).
Upper South Dam Storage Capacity & Surface Area
The reservoir has a normal storage capacity of 40,100 acre-ft (49,463 Ml) and maximum capacity of 55,000 acre-ft (67,841 Ml).
The surface area of the reservoir is 7,000 acres (2,833 ha) and the total catchment area is 182 square miles (471 square kilometres).
Upper South Dam Spillway
The dam spillway has a maximum discharge capacity of 4850 cubic feet per second (137 cubic metres per second).
Upper South Dam Compared to Five Famous American Dams
Upper South Dam Weather
Current Conditions at Upper South Dam
Failed to fetch current weather data.7-Day Forecast for Upper South Dam
Failed to fetch weather forecast data.Upper South Dam Frequently Asked Questions
Upper South Dam is in Michigan.
Upper South Dam is in Alpena County.
Upper South Dam is 20 feet high.
Upper South Dam is 350 feet long.
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Condition Assessment Classification
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.
Source: National Inventory of Dams