The Treaty of 1855 between the Tribes of Middle Oregon and the U.S. Government identified the boundaries of the Warm Springs Reservation and its ceded lands.  These treaty-ceded lands include areas once occupied by the CTWSRO tribes (+ 10 million acres) and included reserved (to the Tribes and their descendants) rights to the land. In exchange for land cessions by treaty, the U.S. Government is obligated to the CTWSRO.

The CTWSRO reserved rights extend throughout these ceded lands (see map of 1855 treaty-ceded lands of rate CTWSRO). During treaty negotiations, the tribes also reserved rights to continue to access and use usual and accustomed places for traditional purposes. Usual and accustomed places are areas located within and outside of the ceded lands where the tribes have rights to frequent for hunting, fishing, gathering and other cultural practices. A few of these sites include, but are not limited to, Willamette Falls, the north shore of the Columbia River (Bonneville and The Dalles reservoirs) and Sherars Falls.  At all of these places, tribal members have the right to fish and practice their traditional cultural activities.

WSGV CRD has built the program and staff capacity to serve as uniquely qualified experts on CTWSRO sites and cultural uses of CTWSRO ceded and Usual and Accustomed Places, cultural and ceremonial sites, and best practices for cultural resources protection consistent with CTWSRO values, tribal laws, and OR SHPO and other federal and state standards. WSGV CRD specializes in cultural resources protection within CTWSRO ceded lands and Usual and Accustomed Places.