Archives: COAs

A rather small bay for the size of the river the COA is low elevation and low gradient with many islands and salt/freshwater marshes

This COA stretches many miles from tidally influenced to the Willamette Valley and represents may strategy habitats.

This area is a long east-west running ridgline typical of the unique geology and ecology of the Klamath Mountains. It contains the head-waters for a number of stream, large mature conifers, and open alpine meadows.

Located at the southern edge of the Blue Mountains Ecoregion, just west of the Silvies River. Area includes ecologically significant stretch of Silver Creek and its surrounding habitat

This Siletz River COA is a sandstone/basalt river system with variable flashy winter river flows. The surrounding forest are primarily private owned and are actively managed for wood production.

The Siletz estuary is a diverse and complex habitat system, occupied by numerous fish and wildlife species.

This area contains important Oregon and California Oak Woodlands and Ceanothus Shrublands. It is

Area is located in the foothills of the Coast Range Mountains and includes the Upper Tualatin-Scoggins Watershed, portions of the North Yamhill River and headwater tributaries, Mount Richmond, and the Oak Ridge / Moore’s Valley area.

This area is located north of Portland and is comprised of Sauvie Island, Multnomah Channel, the Scappoose Bay area and the eastern most slopes of Forest Park along Highway 30.

The North Santiam River Corridor that borders Linn and Marion Counties from the confluence with the Willamette River through confluences of Jefferson ditch and Valentine Creek near Stayton and the South Santiam River ‘s Confluences with Spring Branch, Thomas Creek, Spring Creek, Crabtree Creek, Onehorse Slough, and Noble Creek to Sweet Home.