US GEOLOGICAL SURVEY, OREGON WATER SCIENCE CENTER
WATER AVAILABILITY REPORT FOR MAY 2026
------------------- Change ---------------------
Monthly mean in dis- Accumulated Runoff
discharge charge For the Period
------------------- from Oct. to May
NRCS Cubic Percent previous ---------------------
SWSI feet per of month Percent
Station Basin second average (percent) of average
------------------------------------------------------------------------------------------
Donner Und Blitzen Harney 138 36 11 65
nr Frenchglen
(*)Deep Creek Lake 35 8 -73 56
above Adel County
(*)Chewaucan River Lake 87 18 -51 80
near Paisley County
Williamson River Klamath 608 43 -24 72
near Chiloquin
Owyhee River Owyhee 118 7 -42 20
near Rome
(*)NF Malheur River Malheur 84 26 -34 52
near Beulah
Grande Ronde R Grande Ronde 3,150 43 -31 77
at Troy Powder/Burnt
Umatilla River Umatilla 133 28 -78 91
nr Gibbon Lower John Day
John Day River Upper John Day 1,270 25 -54 51
at Service Crk
(*)Little Deschutes Upper 105 34 -4 53
River nr LaPine Deschutes
Hood River Lower Deschutes 474 40 -39 88
nr Hood River Mt.Hood
Willamette River Willamette 10,500 51 -38 68
at Salem
Wilson River North 321 52 -55 98
near Tillamook Coast
Umpqua River Rogue/Umpqua 2,140 34 -69 52
near Elkton
Rogue River Rogue/Umpqua 2,350 43 -8 54
near Agness
SF Coquille River South Coast 124 30 -74 51
at Powers
Chetco River South Coast 391 30 -59 60
near Brookings
All data should be considered provisional and subject to revision.
Percent of average computed using 30-year base period, water years 1991-2020.
(*) provided by Oregon Water Resources Department
6/1/2026