Topock (Mojave: Tuupak) is a small unincorporated community and census-designated place (CDP) in Mohave County, Arizona, United States.

[4] The crossings of the Colorado River at Topock, including the Old Trails Arch Bridge, are also featured prominently in the opening credits of the movie Easy Rider.

"[10] In the 1950s and 1960s, at both Topock and Hinkley compressor stations, hexavalent chromium in the form of an additive was used in rust-prevention in "the cooling towers that prepared the gas for transportation through PG&E's pipeline to northern and central California.

"[10][11] Topock Compressor Station is located in eastern San Bernardino County, California, approximately 12 miles (19 km) southeast of Needles, along the Colorado River.

PG&E continues to provide reports on their soil investigation and remedial activities at the Topock compressor station site regarding potential future impacts to the Colorado River and to Arizona's groundwater.