The creek has its mouth at the Spokane River in Riverside State Park where it cuts a thin canyon through basalt with depths reaching over 600 feet from the land above.

[3] North Fork Deep Creek has its source at Audubon Lake in the town of Reardan in neighboring Lincoln County[4] Audubon Lake also serves as the source of Crab Creek which flows west into the Columbia River.

[7] Two miles from the confluence the creek flows through the community to which it gave its name where it passes under U.S. Route 2.

[10] A bridge carrying the Spokane River Centennial Trail crosses over the creek at its mouth.

The community of Nine Mile Falls is located across the Spokane River from the mouth of Deep Creek.