Slough OR

Isthmus Slough

Oregon • 43.3635, -124.2059

Hydrography profile Updated Dec 30, 2025

Checking mapped path coverage…

USGS and NOAA data is for informational purposes. Source notes

Length

11 mi

18 km

Elevation

7′ → -1′

8 ft drop

Stream Order

Large River

Slope

0.01%

0.7 ft/mi

Drainage

33 mi²

87 km²

Avg Flow

-- cfs

1.4 mph velocity

Path to Mouth

24 mi

39 km to ocean

Classification

Tributary

Mid-reach

Elevation Profile

Water Quality

Data from EPA Water Quality Portal (USGS, EPA, state agencies).

Data from USGS & NOAA for informational purposes only. Read source and safety notes

Access Sites on Isthmus Slough

There are 1 boat ramps, launches, and public access points on Isthmus Slough.