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Oregon Iron Works, Inc. (OIW) is an American manufacturer of complex structural components and systems and specialized vehicles, located in the Clackamas area in the southeastern suburbs of Portland, Oregon (within the Portland metropolitan area). Established in 1944, it is involved in a number of different industries, supplying products ranging from high-speed boats for military use to purpose-built girders for roadway bridges. It has production facilities in Clackamas and in Vancouver, Washington, and currently employs about 400 people. In May 2014, the company announced that it was merging with Portland-based Vigor Industrial.

United Streetcar, LLC, was an American manufacturer of modern streetcars, located in the Clackamas area in the southeastern suburbs of Portland, Oregon, founded in 2005. It was the only U.S. company building modern streetcars—as distinct from light rail cars or new replicas of historic streetcars—until 2013, when Brookville received its first order for a modern (as opposed to faux historic) streetcar, for the Dallas Streetcar.United Streetcar was a limited liability company and was a wholly owned subsidiary of Oregon Iron Works, Inc. (OIW), which has been in business since 1944. It was originally reported to have been established in early 2007, after OIW was the successful bidder for a contract to construct a prototype streetcar for the city of Portland, but in 2010 the company clarified that it had been formed in December 2005. The company completed its first streetcar in 2009. It was dissolved in February 2015.

Clackamas Education Service District is an education service district that coordinates school events and activities throughout the school districts in Clackamas County, Oregon. Clackamas ESD serves the educational needs of students and families in Clackamas County – a geographic area of 1,879 square miles. Clackamas ESD is governed by a citizen-elected Board of Directors and an appointed advisor representing employment training. Five of the Board positions represent geographical zones and two are designated at-large. All members serve four-year terms.

Clackamas Web Academy is a public school in Clackamas, Oregon, United States.

Kaiser Sunnyside Medical Center is a not-for-profit, general care hospital in the Sunnyside area of Clackamas County in the U.S. state of Oregon. Opened in 1975, the Kaiser Permanente owned facility is licensed for 233 hospital beds. Located in the Portland metropolitan area along Interstate 205 on the eastside, after Bess Kaiser Hospital in north Portland closed, it was Kaiser's only hospital in the Portland area until Westside Medical Center opened in 2013. The hospital includes Clackamas County's only heart surgery facility.

The Oregon Military Museum (OMM) at Camp Withycombe in Clackamas County, Oregon, honors, shares, and preserves Oregon’s military heritage and legacy, including the Oregon National Guard, the state’s early militias, and all branches of the US Armed Forces. Slated to open in 2024, the Museum’s main building includes the main drill floor, weapons, and temporary galleries for permanent and rotating exhibits, as well as the Conference Classroom, Museum Store, Hall of Valor, and the Thomas E. Withycombe Library. Surrounding the main building, the Historic Park, open seasonally, includes two historic buildings, the Quartermaster Storehouse and the Battery A Field Artillery Horse Barn, as well as an outdoor tracked vehicles (tanks) display. The Museum also maintains a Restoration Shop on post. The mission of the Oregon Military Museum (https://oregonmilitarymuseum.org) is: To inspire and educate visitors about Oregon’s military heritage and legacy to include the National Guard, the state’s early militia, and all branches of the Armed Forces. To meet its professional stewardship obligations for the historical artifacts and archives entrusted to its care.

Sunnyside is a former census-designated place in Clackamas County in the U.S. state of Oregon. Located in the Portland metropolitan area along Interstate 205, the population was 6,791 at the 2000 census. The area was not recorded as a distinct place for the 2010 census.

The Clackamas Town Center Transit Center is a bus transit center and MAX Light Rail station on the MAX Green Line, located in Clackamas County, Oregon, in the southeastern part of the Portland metropolitan area. It is the southern terminus for the I-205 MAX branch. Owned by regional transit agency TriMet, the current transit center opened in 2009 and is located on the east side of the Clackamas Town Center mall, adjacent to Interstate 205. An earlier transit center at the mall had opened in 1981.

Mount Talbert is a volcanic cinder cone in Clackamas County, Oregon. It is part of the Boring Lava Field, a zone of ancient volcanic activity in the area around Portland. Its summit rises to an elevation of 740+ ft (230+ m). The butte remains undeveloped and is the location of a nature park of the same name which is managed by North Clackamas Parks & Recreation District. The park has 4.2 miles (6.8 km) of hiking trails, including Park Loop, Summit and West Ridge Trail, along which there are several instructive signs about the area's natural resources. In 2005 the recreation district began promoting regrowth of more fire resistant white oak by girdling and removing Douglas firs, which impede the growth of the oaks by shading out the sun.

Camp Withycombe, located in Clackamas County, Oregon, United States, was originally established as Camp Benson after Governor Frank W. Benson, but was later renamed Camp Withycombe during World War I for Governor James Withycombe.Originally known as the Clackamas Rifle Range, it was established as a training camp in 1909 and expanded during World War I, during which it served as a headquarters for the National Guard, a central supply depot and training center. Pendleton, Oregon photographer Walter S. Bowman photographed Camp Benson in the early 20th century.In the 1930s, the camp became a supply depot. Some of the buildings on the camp property, such as the Adjutant General's house (1938), were built by the Works Progress Administration (WPA). The camp still serves as a training facility, supply depot, and equipment repair facility for the National Guard, but the rifle range is now closed.

Clackamas ( CLAK-ə-məss) is an unincorporated community and former census-designated place (CDP) in Clackamas County, Oregon, United States, and is a suburb of Portland. The population was approximately 7,000 as of 2010. Clackamas is home to Camp Withycombe, which is a military base, and to a branch of the Kaiser Permanente Hospital.

On December 11, 2012, a shooting occurred at the Clackamas Town Center in the relatively urban section of Clackamas County, just outside the city of Portland, Oregon, United States. The gunman, 22-year-old Jacob Tyler Roberts, ran into the shopping center wearing black clothing and a white expressionless facial mask and sporadically opened fire using a Stag Arms AR-15 rifle stolen from a friend. He fired a total of 17 shots, killing two people and seriously wounding a third. Many shots were ricochets. Having attempted to reload his weapon and dropping three magazines, Roberts entered an employee-only back stairwell that runs behind all stores in the mall and committed suicide after descending one level. He had no connection to any of his victims, and it was believed to be a random act of violence.