Big Cliff Dam is located on the North Santiam River approximately 47 miles east of Salem, Ore. and approximately 11 miles northeast of Mill City, Ore. Big Cliff Dam is a 182-foot tall, 295-foot-long concrete gravity dam with a concrete spillway, three spillway gates, a non-overflow section, and a powerhouse. Big Cliff dam is owned, operated, and maintained by the Portland District of the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1951 and was completed in 1954. Big Cliff Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project.

Big Cliff Dam is 2.8 miles downstream of Detroit Dam. Big Cliff is a re-regulating dam for Detroit and is operated to provide consistent flows into the river downstream while allowing for fluctuations in outflow from Detroit Dam.  The re-regulation of flow allows for Detroit Dam's powerhouse to meet peak electricity demands daily for the region.

Big Cliff Dam is located about 95 miles east of the Cascadia Subduction Zone, a megathrust fault along the Oregon Coast. The Cascadia Subduction Zone can produce very large, long duration earthquakes. The last Cascadia Subduction Zone earthquake occurred in the year 1700.

Click here to learn about risk characterization at Big Cliff Dam. 

Blue River Dam is located on a tributary of the McKenzie River about 38 miles east of Eugene, Ore. It is a rockfill structure with gated concrete spillways that was completed in 1969 at a cost of $32 million. Blue River Dam is a rockfill structure with a gated concrete spillway. Since its construction, the dam has prevented an estimated $375 million in potential flood damages. The reservoir provides 85,000 acre-feet of storage and controls runoff from an 88-square-mile drainage area. At full pool, the lake's surface area is 940 acres.

Blue River Dam works in coordination with Cougar Dam to provide flood risk management, and also provides water quality improvement, irrigation, fish and wildlife habitat and recreation.

Click here to learn about risk characterization at Blue River Dam. 

Cottage Grove Dam is located on the Coast Fork Willamette River, approximately 5 miles upstream of Cottage Grove, Oregon. Cottage Grove Dam is a 95ft tall, 1,750ft long earthen embankment dam with a 264ft long concrete ungated spillway, and a 96ft wide concrete non-overflow section. Cottage Grove Dam is owned, operated, and maintained by the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1940 and was completed in 1942. Cottage Grove Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project (WVP). Cottage Grove Dam is one of four WVP dams that does not include a powerhouse. 

Click here to learn about risk characterization at Cottage Grove Dam. 

Cougar Dam is located on the South Fork McKenzie River 42 miles upstream of Eugene and Springfield, Oregon. Cougar Dam is a 519 ft tall, 1,600 ft long rockfill earthen embankment dam with a concrete spillway, two spillway gates, an intake structure with regulating outlet, and a powerhouse. Cougar Dam is owned, operated, and maintained by the Portland District of the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1959 and was completed in 1963. Cougar Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project.

Click here to learn about risk characterization at Foster Dam. 

Detroit Dam is located on the North Santiam River 48 miles upstream the confluence with the Willamette River and 13 miles upstream of Mill City, Oregon. Detroit Dam is a 450 ft tall, 1,450 ft long concrete gravity dam, comprised of 32 monoliths, with a gated spillway with six spillway gates, four regulating outlets, and a powerhouse. Detroit Dam is owned, operated, and maintained by the Portland District of the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1949 and was completed in 1953. Detroit Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project.

Click here to learn about risk characterization at Detroit Dam. 

Dexter Dam is located on the Middle Fork Willamette River in Lowell, Oregon and 20 miles upstream of Eugene and Springfield, Oregon. Dexter Dam is a 90 ft tall, 2,319ft long rockfill earthen embankment dam with a 359 ft long concrete spillway equipped with seven spillway gates, regulating outlet, and a powerhouse. Dexter Dam is owned, operated, and maintained by the Portland District of the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1947 and was completed in 1955. Dexter Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project.

Dexter Dam is 1 mile downstream of Lookout Point Dam. Dexter Dam is a re-regulating dam for Lookout Point and is operated to provide consistent flows into the river downstream while allowing for fluctuations in outflow from Lookout Point Dam.  The re-regulation of flow allows for Lookout Point Dam's powerhouse to meet peak electricity demands on a daily basis for the region.

Dexter Dam is located about 70 miles east of the Cascadia Subduction Zone a megathrust fault along the Oregon Coast. The Cascadia Subduction Zone is capable of producing very large, long duration earthquakes. The last Cascadia Subduction Zone earthquake occurred in the year 1700.

Click here to learn about risk characterization at Dexter Dam. 

Dorena Dam is located on the Row River six miles upstream of Cottage Grove, Oregon. Dorena Dam is a 145 ft tall, 2,600 ft long earthen embankment dam with an ungated 200 ft long concrete spillway and gated regulating outlets. Dorena Dam is owned, operated, and maintained by the Portland District of the U.S. Army Corps of Engineers (USACE).  Construction of the dam was completed in 1949. A privately owned hydropower facility was added to the dam and began operation in 2014. The hydropower facility is regulated by Federal Energy Regulatory Commission (FERC). Dorena Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project.

Click here to learn about risk characterization at Dorena Dam. 

Fall Creek Dam is located on Fall Creek, a major tributary to the Middle Fork Willamette River, one mile upstream of Unity, Oregon and 25 miles upstream of Eugene and Springfield, Oregon. Fall Creek Dam is a 205-foot tall, 5,050-foot long rockfill earthen embankment dam with a concrete spillway, two spillway gates, and a regulating outlet. Fall Creek Dam is owned, operated, and maintained by the Portland District of the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1964 and was completed in 1965.  Fall Creek Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of recreation, irrigation, municipal and industrial water supply, fish and wildlife, conservation, water quality, and hydropower. Collectively, this system of dams is referred to as the Willamette Valley Project (WVP). Fall Creek Dam is one of four WVP dams that does not include a powerhouse.

Click here to learn about risk characterization at Fall Creek Dam. 

Fern Ridge Dam is located on the Long Tom River 13 miles upstream of Monroe, Ore., and 24 miles upstream of the confluence of the Long Tom and Willamette Rivers. Fern Ridge Dam is a 50-foot tall, 6,330-foot long earthen embankment dam built on a soil foundation with a concrete spillway, six spillway gates, a gated regulating outlet, and two earthen auxiliary dikes. Fern Ridge Dam is owned, operated, and maintained by the Portland District of the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1940 and was completed in 1942. In 2005, the downstream portions of the earthen embankment were completely reconstructed to address concerns with seepage through the embankment’s soil foundation. The reconstruction included installation of a drainage system to collect seepage through the foundation and instrumentation to monitor the drainage system's performance during normal reservoir operations and during flood events. Fern Ridge Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of recreation, irrigation, municipal and industrial water supply, fish and wildlife,  water quality and hydropower. Collectively, this system of dams is referred to as the Willamette Valley Project (WVP.) Fern Ridge is one of four WVP dams that do not include a powerhouse.   

Click here to learn about risk characterization at Fern Ridge Dam. 

Foster Dam is located on the South Santiam River approximately 30 miles upstream of Albany, Oregon. Foster Dam is a 126-foot tall, 2,985-foot long rockfill earthen embankment dam with a 400-foot long concrete spillway, four spillway gates, a concrete non-overflow section, and a powerhouse. Foster Dam is owned, operated, and maintained by the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1964 and was completed in 1968. Foster Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife,  and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project. 

Foster Dam is 75 miles east of the Cascadia Subduction Zone, a megathrust fault along the Oregon Coast. Cascadia Subduction Zone, a megathrust fault along the Oregon Coast. The Cascadia Subduction Zone can produce very large, long duration earthquakes. The last Cascadia Subduction Zone earthquake occurred in the year 1700. 

Click here to learn about risk characterization at Foster Dam. 

Green Peter Dam is located on the South Santiam River seven miles upstream of Foster Dam and ten miles upstream of Sweet Home, Ore. Green Peter Dam is a 378-foot tall, 1,500-foot long concrete gravity dam with a concrete spillway, two spillway gates, two regulating outlets, and a powerhouse. Green Peter Dam is owned, operated, and maintained by the Portland District of the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1963 and was completed in 1966. Green Peter Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife,  and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project. 

Click here to learn about risk characterization at Green Peter Dam. 

Hills Creek Dam is located on the Middle Fork of the Willamette River three miles upstream of Oakridge and 42 miles upstream of Eugene and Springfield, Oregon. Hills Creek Dam is a 304-foot tall, 1,920-foot long rockfill earthen embankment dam with a concrete spillway, three spillway gates, an intake structure with regulating outlet, and a powerhouse. Hills Creek dam is owned, operated, and maintained by the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1956 and was completed in 1961.  Hills Creek is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project. 

Hills Creek Dam is 90 miles east of the Cascadia Subduction Zone, a megathrust fault along the Oregon Coast. Cascadia Subduction Zone, a megathrust fault along the Oregon Coast. The Cascadia Subduction Zone can produce very large, long duration earthquakes. The last Cascadia Subduction Zone earthquake occurred in the year 1700. 

Click here to learn about risk characterization at Hills Creek. 

Lookout Point Dam is located on the Middle Fork of the Willamette River 22 miles upstream of Eugene and Springfield, Oregon. Lookout Point Dam is a 246-foot tall, 1,875-foot long rockfill earthen embankment dam with a concrete spillway, five spillway gates, a concrete non-overflow section, and a powerhouse with regulating outlets. Lookout Point dam is owned, operated, and maintained by the U.S. Army Corps of Engineers (USACE). Construction of the dam began in 1948 and was completed in 1954. Lookout Point Dam is part of a system of 13 multi-purpose dams in the Willamette Valley with the primary purpose of flood risk management and secondary purposes of hydropower, recreation, irrigation, municipal and industrial water supply, fish and wildlife, and water quality. Collectively, this system of dams is referred to as the Willamette Valley Project. 

Click here to learn about risk characterization at Lookout Point Dam.