California Subwatershed Facts
The subwatershed consists of 267 acres in southwest Portland.
- Purple martins have been observed in the vicinity of Willamette Park.
- There are 1,378 feet of open stream channels in this subwatershed.
- Thirty nine acres of the subwatershed are parks and open space, 46 acres are in public ownership.
- About half of this subwatershed is impervious area, mostly streets.
- Willamette Park provides stop-over habitat for osprey, hawks, herons, and neo-tropical migratory birds.
Forty one acres of the subwatershed are forested.
- Thirty nine acres of the subwatershed have woodland type tree canopy.
- One perennial creek and several seasonal creeks originate in George Himes Park near Terwilliger Parkway and flow to a combined sanitary and stormwater pipe near Interstate 5.
- The forested areas and streams of the subwatershed provide an important link between the West Hills and the Ross Island-Oaks Bottom ecosystem complex to the east, and between Marquam Nature Park to the north and Tryon Creek State Natural Area to the south.