As the
Columbia River exits the
Portland Basin, it becomes laterally confined by the
Coast Range and
Cascade Range foothills before re-expanding downstream into its
estuarine reach. Kalama is situated on this narrow
floodplain along the east bank of the river, where surrounding terrain constrains development away from the channel. Located in Southwest
Washington, Kalama is the fourth-largest city in
Cowlitz County. According to Cowlitz County
GIS data, the total incorporated area for the city of Kalama is 3.83 square miles (9.9 km2). The elevation ranges from 2ft (0.6m) to 1125ft (343m), with an average elevation of 227ft (69m).
Longview, the largest city in the county, is 10mi (16km) to the north. Kalama sits along the
Interstate 5 (I-5) corridor between the
Seattle metropolitan area, 113 mi (182 km) to the north, and the
Portland metropolitan area, 35 mi (56 km) to the south. Highway access to Kalama is provided by Exit 27, Exit 30, and Exit 32 from I-5. Kalama sits along the final stretch of the Columbia River, after the last major
confluence, approximately 75 river miles (121km) from the
Pacific Ocean. Based on the nearest
USGS gauge, typical discharge in the Columbia River near Kalama is on the order of hundreds of thousands of cubic feet per second (tens of thousands of cubic meters per second), with seasonal highs in spring and lows in late summer. In 2023, average monthly discharge peaked in May at approximately 408,000 CFS (11,560 m³/s) and declined to about 92,900 CFS (2,630 m³/s) in September, representing a more than fourfold difference between seasonal high and low flows. Discharge in the Columbia River near Kalama is comparable in magnitude to major North American rivers such as the
Ohio River and exceeds that of the
Yukon River. A small fraction of this flow is contributed by the
Kalama River, a 45mi (72 km) tributary that originates in the Cascade Range just south of
Mount St. Helens and joins the Columbia River just outside of Kalama city limits. The Port of Kalama is a significant maritime terminal on the Columbia River, handling millions of tons of dry bulk cargo annually. Over 100,000 rail cars arrive at the port each year, bringing soybeans, corn, and wheat from Oregon, Washington, Idaho, Montana, North and South Dakota, Nebraska, Minnesota, and Wisconsin for export to international markets. From their terminal at the Port of Kalama, TEMCO LLC loads over 125 oceangoing vessels annually, with their top destinations being China, Southeast Asia, Central America, and the Middle East. By tonnage, the Port of Kalama ranked 37th in the country in 2022, with 50x more exported than imported by weight. The man made Lower Columbia River Channel extends 106.5mi (171km) from the Pacific Ocean to Vancouver, passing by and serving the Port of Kalama. It has been incrementally expanded, most recently updated to 600ft (183m) wide and 43ft (13m) deep to accommodate modern bulk cargo and container vessels.
Climate This region experiences warm (but not hot) and dry summers, with no average monthly temperatures above . According to the
Köppen Climate Classification system, Kalama has a
warm-summer Mediterranean climate, abbreviated "Csb" on climate maps. ==Demographics==