Hawaii HUC8 20010000
A 13,191 km² sub-basin of the Hawaii region in HI. Drought coverage is from the US Drought Monitor (map of 2026-09-01); streamflow classes place each USGS gauge's latest reading against its own day-of-year record.
Health score
73
Moderate
Drought index
21
Abnormally dry
Area in D2+
0%
0% exceptional (D4)
Gauges below normal
0%
of 8 reporting
Median flow
208%
p78 of record
Water assets
1,175
76 springs · 743 wells
USGS gauges (13)
- Kohakohau Stream above intake, nr Kamuela, HI167561004 cfsp52 · normal
- Kawainui Stream nr Kamuela, HI167200006 cfsp67 · normal
- Alakahi Stream near Kamuela, HI167250005 cfsp75 · normal
- Waikoloa Str at Marine Dam nr Kamuela, HI167580007 cfsp76 · above normal
- Waikoloa Stream nr Kamuela, HI167570007 cfsp80 · above normal
- Wailuku River at Piihonua, HI16704000540 cfsp94 · much above normal
- Honolii Stream nr Papaikou, HI16717000316 cfsp95 · much above normal
- Wailuku River nr Kaumana, HI1670180012 cfsp97 · much above normal
- Hakalau Stream nr alt 1300 ft, HI1671770026 cfsno long-term record
- Manowaiopae Stream near Spencer Road, HI167178157 cfsno long-term record
- Awini Puali Gulch US of Kohala Ditch, HI167515001 cfsno long-term record
- Waiaha Stream at Holualoa, HI167596000 cfsno long-term record
- Paauau Gulch at Pahala, HI16770500no readingno long-term record
Recent conditions
| Date | DSCI | D2+ % | Gauges low | Flow pct |
|---|---|---|---|---|
| 2026-09-07 | 21 | 0 | 0/8 | p78 |
Top water assets
- 77Deep Basal Fossil Aquifer — Big Island Hawaiifossil_water
- 67Waikoloa Str At Marine Dam Nr Kamuela, Hiriver
- 67Waikoloa Stream Nr Kamuela, Hiriver
- 67Kawainui Stream Nr Kamuela, Hiriver
- 66Keaiwa Reservoirreservoir
- 66Waikoloa Reservoir No. 2reservoir
- 66Waikoloa Reservoir No. 1reservoir
- 66Paauilo Reservoirreservoir
- 65Wailuku River At Piihonua, Hiriver
- 65Puukapu Watershed Retarding Dam R-1reservoir