The Grand River Dam Authority Police office is located in the GRDA Ecosystems & Education Center located on the west end of Pensacola Dam in Langley. It is the central point of dispatch for GRDA’s police force which is responsible for the safety of people enjoying the recreational opportunities on all GRDA waters, as well as the enforcement of GRDA lake regulations. The GRDA Police Department is also responsible for the patrol and protection of all GRDA assets. If you have an emergency on the water, the GRDA Police urges you to call 911. The department’s non-emergency number is 918 256 0911.