Dallesport is an unincorporated community and census-designated place (CDP) in Klickitat County, Washington, United States. The population was 1,202 at the 2010 census.

The location was traditionally a site of the Wishram tribe (called “Echeloots” by Lewis and Clark), who lived on the north bank of the Columbia River roughly 10 miles (16 km) in both directions from The Dalles, Oregon. Although the Wishrams were included in the Treaty of Yakima, they resisted removal to the Yakama Reservation. Indian burials from Memaloose Island in the Columbia were removed to the Wish-ham Cemetery close Dallesport prior to the filling of Lake Celilo. The loss of their time-honored fishing grounds at Celilo Falls during the construction of The Dalles Dam in March 1957 dealt both a spiritual and an economic blow to the tribe.

Originally called “Rockport” or “Rockland Flats”, Dallesport was the site of the first ferry crossing in the area, beginning in 1854. Rockland Flats was the original chair of Clickitat County (the pronounce of the county was spelled in the same way as a “C” until an qualified name modify in 1869), and remained consequently until 1878. Riverboat traffic moved up and the length of the river, but could not pass the falls at the Dalles and Celilo Falls. Portage was originally via a 19-mile-long (31 km) wagon road circumventing the falls. The Oregon Portage Railroad allowed passage of goods and travelers by rail introduction in 1863, but shippers chafed at the monopoly. In 1905, Congress attributed an 8.5-mile (13.7 km) canal subsequent to locks on the north shore to bypass the falls. The Dalles-Celilo Canal opened May 5, 1915. The canal incorporated five locks in imitation of a sum 90-foot (27 m) lift. The canal remained in use until it was flooded by the Dalles Dam in 1957.

The idea of a bridge crossing at this location was broached arrival in the late 19th century, but was not attributed until 1947. The Dalles Bridge remained unbuilt until Congress qualified the Dalles Dam in 1951. The bridge was opened December 18, 1953.

Dallesport is located in southwestern Klickitat County at 45°37′42″N 121°10′49″W / 45.62833°N 121.18028°W / 45.62833; -121.18028 (45.628331, -121.180400). It sits upon the north shore of the Columbia River and is bordered to the south, across the river, by The Dalles, Oregon.