River SD

South Fork Moreau River

South Dakota • 45.1287, -103.2734

Hydrography profile Updated Feb 1, 2026

Checking mapped path coverage…

USGS and NOAA data is for informational purposes. Source notes

Length

136 mi

218 km

Elevation

3,444′ → 2,541′

902 ft drop

Stream Order

Large River

Slope

0.13%

6.6 ft/mi

Drainage

987 mi²

2,557 km²

Avg Flow

-- cfs

1.4 mph velocity

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. More