California Code, Fish and Game Code - FGC § 375

The commission may negotiate the terms of a compact between the States of Arizona and California with any appropriate officials of the State of Arizona in relation to reciprocal privileges and licenses for hunting and fishing by residents of one of the states within the territorial jurisdiction of the other. The negotiations shall include, but shall not be limited to, provisions relating to sport fishing and the hunting of migratory waterfowl in, on, or along the Colorado River.

It is the primary purpose of this section to provide a method whereby the hunting and fishing opportunities afforded by the Colorado River may be mutually enjoyed by the residents of the States of Arizona and California despite the difficulties and inconveniences that result from the fact that the boundary line between the States of Arizona and California is the middle of the channel of the Colorado River.