All have their headwaters in the eastern Sierra Nevada, near the border with Fresno County. The forks all flow into lakes while still at high elevations. The North Fork flows into North Lake, the Middle Fork flows into Lake Sabrina.
The headwaters of all are located in the eastern Sierra Nevada, near the boundary with Fresno County. These tributaries eventually flow into lakes before reaching high altitudes. The North Fork empties into North Lake, while the Middle Fork feeds Lake Sabrina.