The National Marine Fisheries Service proposes to implement annual management measures and harvest specifications to establish the allowable catch levels for the northern subpopulation of Pacific sardine in the U.S. Exclusive Economic Zone off the Pacific coast for the fishing season of July 1, 2017, through June 30, 2018. The proposed action would prohibit directed non-tribal Pacific sardine commercial fishing for Pacific sardine off the coasts of Washington, Oregon, and California, which is required because the estimated 2017 biomass of Pacific sardine has dropped below the biomass threshold specified in the HG control rule. Under the proposed action, Pacific sardine may still be harvested as part of either the live bait or tribal fishery, or as incidental catch in other fisheries. This proposed rule is intended to conserve and manage the Pacific sardine stock off the U.S. West Coast.