In 2001, 21 northwestern Washington tribes, joined by the United States filed a Request for Determination in U.S. District Court, asking the court to find that the state has a treaty-based duty to preserve fish runs and habitat sufficiently for the tribes to earn a "moderate living" and sought to compel the state to repair or replace culverts that impede salmon migration. On August 22, 2007, the district court issued a summary judgment order, holding that while culverts impeding anadromous fish migration are not the only factor diminishing their upstream habitat, in building and maintaining culverts that impede salmon migration, Washington State had diminished the size of salmon runs within the case area and thereby violated its obligation under the Stevens Treaties. On March 29, 2013, the court issued an injunction, ordering the state to significantly increase the effort for removing state-owned culverts that block habitat for salmon and steelhead and to replace the state-owned culverts that have the greatest adverse impact on the habitat of andromadous fish by 2030.