Lake Jefferson Dam, Minnesota, USA

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Quick Facts About Lake Jefferson Dam

Location: Le Sueur, Minnesota
Coordinates: 44.27787, -93.74338
River: Big Cannon River – Tr
Primary Purpose: Recreation
Type: Gravity
Commissioned: 1938
Dam Height: 7 ft (2 m)
Dam Length: 15 ft (5 m)
Dam Capacity: 25,489 acre-ft (31,440 Ml)
Condition Assessment: Satisfactory

Lake Jefferson Dam Map

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Lake Jefferson Dam Information

Lake Jefferson Dam is a gravity dam located about 12 miles from Waterville, Le Sueur, Minnesota.

The dam, which is on the Big Cannon River – Tr, was primarily built for Recreation purposes, but also serves for benefits.

The dam was designed by and commissioned in 1938 and is currently owned by MNDNR-Trails.

Lake Jefferson Dam Structure

The Lake Jefferson Dam is approximately 15 feet (5 m) long, 7 feet (2 m) high and has a structural volume of cubic yards (0 cubic metres).

Lake Jefferson Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 18,544 acre-ft (22,874 Ml) and maximum capacity of 25,489 acre-ft (31,440 Ml).

The surface area of the reservoir is 700 acres (283 ha) and the total catchment area is 16 square miles (42 square kilometres).

Lake Jefferson Dam Spillway

The dam spillway has a maximum discharge capacity of 265 cubic feet per second (8 cubic metres per second).

Lake Jefferson Dam Compared to Four Famous American Dams

Lake Jefferson Dam
Le Sueur, Minnesota
Hoover Dam
Clark County, Nevada
Grand Coulee Dam
Okanogan County, Washington
Theodore Roosevelt Dam
Maricopa County, Arizona
Glen Canyon Dam
Coconino County, Arizona
Height (ft) 7 730 550 357 216
Length (Ft) 15 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 25,489 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 16 167,800 74,100 3,611 108,355

Lake Jefferson Dam Weather

Current Conditions at Lake Jefferson Dam

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7-Day Forecast for Lake Jefferson Dam

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Lake Jefferson Dam Frequently Asked Questions

In which state is the Lake Jefferson Dam?

Lake Jefferson Dam is in Minnesota.

In which county is the Lake Jefferson Dam?

Lake Jefferson Dam is in Le Sueur County.

How high is the Lake Jefferson Dam?

Lake Jefferson Dam is 7 feet high.

How long is the Lake Jefferson Dam?

Lake Jefferson Dam is 15 feet long.

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

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