SR 124 begins at a dogbone interchange with US 12 in Burbank on the eastern shore of the Snake River near its confluence with the Columbia River in Pasco (part of the Tri-Cities). The highway travels east from the interchange onto Ice Harbor Drive after passing Hood Park on the shore of the Snake River and a local branch library. The two-lane road is rural with a speed limit of as it passes north of the McNary National Wildlife Refuge. SR 124 dips northeast and crosses over a set of railroad tracks carrying the Ayer Subdivision of the Union Pacific Railroad north towards the Ice Harbor Lock and Dam.