Active USGS

Koolau Reservoir Near Wahiawa, Oahu, HI

Updated August 2, 2026 at 06:50:00 AM · Provisional · Site 16206600

Current conditions

Historical trends

Hourly measurements

Detailed readings by hour, organized by day

Nearby stations

Other monitoring locations nearby

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Official USGS page: https://waterdata.usgs.gov/monitoring-location/USGS-16206600/ (may include cooperator information)