Part of the upper creek flows through San Bernardino National Forest.

At Discovery little was to be learned of the upper creek.

The primary inhabitants of the upper creek are yabbies, eels, possums etc.

This preserve status is credited with maintaining the upper creek's floodplain in its natural state for over one century.

Boaters and anglers have also clashed, and invasive species are beginning to enter the upper creek as well.

About six miles (10 km) to the east, the town of Lopez is the largest settlement on the upper creek.

The upper creek, above Warsaw, is stocked with 1,850 yearling brown trout in the spring of each year, supplementing an indigenous wild population.

Small wild rainbow trout also inhabit the upper creek and its forks.

The upper creek is also used for irrigation.

The upper creek flows through suburban communities west of New York City.