The Gilbert River is a tributary of the Multnomah Channel on Sauvie Island in the U.S. state of Oregon.

[1] It enters the channel about 6 miles (10 km) from its confluence with the Columbia River.

Its three named tributaries from source to mouth are Ash, Jack, and Mud sloughs, and it connects by water to a complex of lakes across the island including Steelman, Round, Gay, Racetrack, Malarky, and McNary, as well as Sturgeon.

[4] The river is navigable by canoes and shallow-draft boats between Sturgeon Lake and the mouth.

A mooring float with no shore access lies about a quarter mile from the mouth.