River HI

Wailuku River

Hawaii • 19.7151, -155.1761

Hydrography profile Updated Dec 26, 2025

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USGS and NOAA data is for informational purposes. Source notes

Length

24 mi

39 km

Elevation

10,231′ → 18′

10,213 ft drop

Stream Order

Medium River

Slope

7.97%

421.0 ft/mi

Drainage

203 mi²

526 km²

Avg Flow

-- cfs

0.9 mph velocity

Path to Mouth

27 mi

43 km to ocean

Classification

Headwater

Source Stream

Elevation Profile

Water Quality

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

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

Water Level Gauges on Wailuku River

There are 4 USGS water level monitoring stations on Wailuku River providing real-time flow and stage data.

There are 2 boat ramps, launches, and public access points on Wailuku River.