William L. Jess Dam, Oregon, USA

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Quick Facts About William L. Jess Dam

Location: Jackson, Oregon
Coordinates: 42.67048, -122.674317
River: Rogue River
Primary Purpose: Flood Risk Reduction
Type: Rockfill
Commissioned: 1976
Dam Height: 342 ft (104 m)
Dam Length: 3,600 ft (1,097 m)
Dam Capacity: 500,000 acre-ft (616,740 Ml)
Condition Assessment: Not Available

William L. Jess Dam Map

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William L. Jess Dam Information

William L. Jess Dam is a rockfill dam located in Trail, Jackson, Oregon.

The dam, which is on the Rogue River, was primarily built for Flood Risk Reduction purposes, but also serves for Irrigation, Recreation and Hydroelectric benefits.

The dam was designed by and commissioned in 1976 and is currently owned by USACE – Portland District.

William L. Jess Dam Structure

The William L. Jess Dam is approximately 3,600 feet (1,097 m) long, 342 feet (104 m) high and has a structural volume of 10,800,000 cubic yards (8,257,194 cubic metres).

William L. Jess Dam Storage Capacity & Surface Area

The reservoir has a normal storage capacity of 465,000 acre-ft (573,568 Ml) and maximum capacity of 500,000 acre-ft (616,740 Ml).

The surface area of the reservoir is 3,430 acres (1,388 ha) and the total catchment area is 674 square miles (1,746 square kilometres).

William L. Jess Dam Spillway

The dam has a 135 feet (41 m) wide controlled spillway with a maximum discharge capacity of 158000 cubic feet per second (4474 cubic metres per second).

William L. Jess Dam Compared to Four Famous American Dams

William L. Jess Dam
Jackson, Oregon
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) 342 730 550 357 216
Length (Ft) 3,600 1,244 5,673 6,920 1,565
Storage Volume (acre-ft) 500,000 30,237,000 9,562,000 3,540,000 29,875,000
Drainage Area (sq miles) 674 167,800 74,100 3,611 108,355

William L. Jess Dam Weather

Current Conditions at William L. Jess Dam

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7-Day Forecast for William L. Jess Dam

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William L. Jess Dam Frequently Asked Questions

In which state is the William L. Jess Dam?

William L. Jess Dam is in Oregon.

In which county is the William L. Jess Dam?

William L. Jess Dam is in Jackson County.

How high is the William L. Jess Dam?

William L. Jess Dam is 342 feet high.

How long is the William L. Jess Dam?

William L. Jess Dam is 3,600 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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