Pacific Northwest Region HUC 17
The Pacific Northwest Region hydrologic region spans Idaho, Montana, Oregon, Washington, Wyoming and is divided into 229 HUC8 sub-basins. Conditions are the US Drought Monitor's weekly area coverage and the day-of-year streamflow percentiles of the USGS gauges inside each sub-basin, as of 2026-10-22.
Health score
59
Moderate
Drought index
212
Severe
Area in D2+
41.3%
83 sub-basins ≥50%
Gauges below normal
72%
of 648 reporting
Water assets
264,359
avg WIS 50.7
Sub-basins
229
6,638 alerts · 11,763 transfers
quality 51drought 58streamflow 38regulatory 98coverage 70
Sub-basins, driest first
| Sub-basin | Assets | Avg WIS | Drought | Gauges low | Flow pct | Health |
|---|---|---|---|---|---|---|
| Upper Owyhee 17050104 · ID, NV | 1,524 | 60.5 | Exceptional (473) | 33% | p55 | 45 |
| Goose 17040211 · ID, NV, UT | 1,074 | 53.8 | Exceptional (453) | 100% | p8 | 22 |
| Salmon Falls 17040213 · ID, NV | 1,393 | 62.7 | Exceptional (450) | 100% | p8 | 25 |
| Bruneau 17050102 · ID, NV | 1,900 | 60.5 | Exceptional (449) | 100% | p8 | 25 |
| Upper Snake-Rock 17040212 · ID | 4,635 | 45.4 | Exceptional (416) | 86% | p10 | 28 |
| East Little Owyhee 17050106 · ID, NV, OR | 286 | 64.5 | Exceptional (401) | — | — | 42 |
| Middle Owyhee 17050107 · ID, NV, OR | 624 | 56.6 | Exceptional (400) | 100% | p8 | 27 |
| Upper John Day 17070201 · OR | 383 | 51.6 | Exceptional (400) | 100% | p9 | 25 |
| North Fork John Day 17070202 · OR | 152 | 58.6 | Exceptional (400) | 100% | p8 | 28 |
| Middle Fork John Day 17070203 · OR | 60 | 58.4 | Exceptional (400) | 100% | p8 | 27 |
| Raft 17040210 · ID, UT | 1,208 | 54.6 | Extreme (399) | 100% | p6 | 26 |
| Upper Deschutes 17070301 · OR | 1,577 | 44.5 | Extreme (391) | 50% | p25 | 38 |
| Lake Walcott 17040209 · ID | 1,968 | 47.7 | Extreme (387) | 100% | p9 | 30 |
| Middle Fork Willamette 17090001 · OR | 321 | 51.8 | Extreme (384) | 83% | p15 | 36 |
| Upper Crooked 17070304 · OR | 233 | 54.9 | Extreme (382) | — | — | 39 |
| Mckenzie 17090004 · OR | 461 | 52.5 | Extreme (381) | 75% | p10 | 36 |
| Trout 17070307 · OR | 134 | 51.8 | Extreme (379) | — | — | 38 |
| South Fork Owyhee 17050105 · ID, NV, OR | 960 | 62.4 | Extreme (378) | — | — | 43 |
| American Falls 17040206 · ID | 2,230 | 48 | Extreme (373) | 67% | p24 | 43 |
| C.J. Strike Reservoir 17050101 · ID | 1,162 | 49.4 | Extreme (368) | 100% | p5 | 27 |
| Lower Crooked 17070305 · OR | 471 | 48.2 | Extreme (366) | 100% | p9 | 26 |
| Upper Grande Ronde 17060104 · OR | 548 | 61 | Extreme (362) | — | — | 44 |
| Upper Spokane 17010305 · ID, WA | 3,030 | 44 | Extreme (353) | 100% | p13 | 31 |
| Methow 17020008 · WA | 1,674 | 53.5 | Extreme (351) | 100% | p12 | 34 |
| Okanogan 17020006 · CN, WA | 1,713 | 53.8 | Extreme (349) | 82% | p16 | 40 |
| Jordan 17050108 · ID, OR | 341 | 57.8 | Extreme (349) | — | — | 44 |
| Portneuf 17040208 · ID | 1,489 | 52.1 | Extreme (347) | 80% | p9 | 37 |
| Camas 17040220 · ID | 757 | 52.7 | Extreme (345) | 100% | p5 | 29 |
| Burnt 17050202 · OR | 423 | 58.2 | Extreme (340) | — | — | 45 |
| Hangman 17010306 · ID, WA | 3,076 | 47.1 | Extreme (339) | 50% | p31 | 48 |
| Powder 17050203 · OR | 753 | 60.4 | Extreme (335) | — | — | 47 |
| Silvies 17120002 · OR | 557 | 59.2 | Extreme (333) | — | — | 46 |
| Similkameen 17020007 · CN, WA | 814 | 61.9 | Extreme (327) | 100% | p8 | 34 |
| Umatilla 17070103 · OR | 1,687 | 53.2 | Extreme (322) | 50% | p20 | 46 |
| Upper Malheur 17050116 · OR | 769 | 55.7 | Extreme (322) | — | — | 46 |
| Coeur d'Alene Lake 17010303 · ID, WA | 639 | 49.6 | Extreme (321) | 50% | p26 | 45 |
| Little Spokane 17010308 · ID, WA | 6,502 | 44.4 | Extreme (317) | 100% | p9 | 28 |
| South Santiam 17090006 · OR | 430 | 58.1 | Extreme (311) | 86% | p7 | 39 |
| Coast Fork Willamette 17090002 · OR | 132 | 54.6 | Extreme (310) | 40% | p26 | 50 |
| Rock 17060109 · ID, WA | 701 | 53.4 | Extreme (308) | — | — | 46 |
| Crooked-Rattlesnake 17050109 · OR | 246 | 53.9 | Extreme (305) | — | — | 46 |
| Blackfoot 17040207 · ID | 676 | 58.8 | Extreme (304) | 75% | p4 | 42 |
| Little Deschutes 17070302 · OR | 442 | 42.9 | Extreme (303) | — | — | 41 |
| North Umpqua 17100301 · OR | 153 | 52 | Extreme (301) | 46% | p48 | 49 |
| Upper Skagit 17110005 · CN, WA | 2,135 | 56.8 | Extreme (300) | 60% | p9 | 45 |
| Lower Grande Ronde 17060106 · OR, WA | 1,313 | 62 | Extreme (300) | 100% | p10 | 36 |
| Priest 17010215 · CN, ID, WA | 841 | 63.9 | Extreme (300) | 0% | p40 | 66 |
| Lower Snake-Asotin 17060103 · ID, OR, WA | 714 | 55.8 | Extreme (300) | 67% | p16 | 47 |
| Wallowa 17060105 · OR | 690 | 59.5 | Extreme (300) | 50% | p39 | 50 |
| Idaho Falls 17040201 · ID | 620 | 49.9 | Extreme (300) | 71% | p11 | 48 |
| Upper Rogue 17100307 · OR | 410 | 46.7 | Extreme (300) | 29% | p44 | 51 |
| Willow 17040205 · ID | 371 | 62.9 | Severe (299) | 100% | p10 | 43 |
| Imnaha 17060102 · OR | 764 | 62.8 | Severe (297) | — | — | 52 |
| North Santiam 17090005 · OR | 562 | 55.3 | Severe (293) | 100% | p12 | 39 |
| South Umpqua 17100302 · OR | 354 | 50.6 | Severe (293) | 71% | p9 | 42 |
| Middle Rogue 17100308 · OR | 1,051 | 47.5 | Severe (291) | 83% | p20 | 43 |
| Little Wood 17040221 · ID | 1,021 | 50.2 | Severe (291) | 100% | p12 | 39 |
| Palouse 17060108 · ID, WA | 2,969 | 51.2 | Severe (289) | 67% | p20 | 50 |
| Pend Oreille 17010216 · CN, ID, WA | 2,201 | 63.2 | Severe (286) | 0% | p59 | 67 |
| Brownlee Reservoir 17050201 · ID, OR | 589 | 60.6 | Severe (286) | 100% | p9 | 36 |
| Walla Walla 17070102 · OR, WA | 4,128 | 56.1 | Severe (285) | 20% | p36 | 58 |
| Upper Willamette 17090003 · OR | 1,932 | 54.7 | Severe (284) | 67% | p15 | 47 |
| Lower Spokane 17010307 · WA | 3,432 | 47.2 | Severe (280) | 50% | p25 | 47 |
| Beaver-South Fork 17070303 · OR | 261 | 52.5 | Severe (279) | — | — | 48 |
| Bully 17050118 · OR | 254 | 56.3 | Severe (277) | — | — | 50 |
| Middle Snake-Succor 17050103 · ID, OR | 966 | 50.1 | Severe (274) | 100% | p10 | 33 |
| Pend Oreille Lake 17010214 · ID, WA | 2,468 | 42.9 | Severe (272) | — | — | 44 |
| Sumas River 17110001 · CN, WA | 928 | 52.7 | Severe (271) | — | — | 49 |
| Harney-Malheur Lakes 17120001 · OR | 436 | 48.4 | Severe (271) | — | — | 47 |
| Lower John Day 17070204 · OR | 434 | 57.7 | Severe (268) | 100% | p10 | 43 |
| Sanpoil 17020004 · WA | 1,149 | 58.5 | Severe (266) | 100% | p7 | 37 |
| Lower Owyhee 17050110 · OR | 474 | 52.3 | Severe (265) | 0% | p66 | 65 |
| Alvord Lake 17120009 · NV, OR | 570 | 56.9 | Severe (264) | — | — | 52 |
| Willow 17050119 · OR | 328 | 56.5 | Severe (262) | — | — | 52 |
| Clearwater 17060306 · ID, WA | 648 | 58.6 | Severe (261) | 60% | p20 | 51 |
| Umpqua 17100303 · OR | 370 | 48.9 | Severe (259) | 50% | p21 | 54 |
| Kettle 17020002 · CN, WA | 1,259 | 60.8 | Severe (258) | 100% | p11 | 43 |
| Lower Deschutes 17070306 · OR | 483 | 47.7 | Severe (255) | 71% | p10 | 42 |
| Lower Snake-Tucannon 17060107 · ID, WA | 1,032 | 57.6 | Severe (254) | 0% | p43 | 67 |
| Salt 17040105 · ID, WY | 337 | 59.5 | Severe (254) | 100% | p16 | 43 |
| South Fork Coeur d'Alene 17010302 · ID, MT | 201 | 57.5 | Severe (251) | 83% | p11 | 46 |
| Lake Chelan 17020009 · WA | 522 | 53 | Severe (248) | 100% | p5 | 36 |
| Donner und Blitzen 17120003 · OR | 186 | 49.9 | Severe (248) | 100% | p10 | 35 |
| Big Wood 17040219 · ID | 1,637 | 51.4 | Severe (247) | 67% | p18 | 52 |
| St. Joe 17010304 · ID, MT | 1,168 | 63.4 | Severe (243) | 100% | p10 | 45 |
| Upper Coeur d'Alene 17010301 · ID, MT | 413 | 65.8 | Severe (241) | 100% | p9 | 41 |
| Hells Canyon 17060101 · ID, OR | 766 | 59.6 | Severe (238) | — | — | 56 |
| Weiser 17050124 · ID | 876 | 54.8 | Severe (236) | 67% | p12 | 51 |
| Lower North Fork Clearwater 17060308 · ID | 280 | 64.1 | Severe (235) | — | — | 59 |
| Upper Crab 17020013 · WA | 1,358 | 47.8 | Severe (233) | 0% | p46 | 65 |
| Clackamas 17090011 · OR | 492 | 49.3 | Severe (233) | 83% | p13 | 44 |
| Lower Malheur 17050117 · OR | 428 | 52.5 | Severe (233) | 0% | p67 | 67 |
| Sauk 17110006 · WA | 1,287 | 61.2 | Severe (231) | 100% | p6 | 40 |
| Nooksack 17110004 · CN, WA | 3,902 | 50.6 | Severe (224) | 100% | p8 | 41 |
| Lower Kootenai 17010104 · CN, ID, MT | 574 | 53 | Severe (221) | 50% | p23 | 58 |
| Palisades 17040104 · ID, WY | 324 | 62.8 | Severe (221) | 100% | p13 | 52 |
| Applegate 17100309 · CA, OR | 300 | 48.8 | Severe (219) | 33% | p38 | 60 |
| Medicine Lodge 17040215 · ID, MT | 695 | 49.3 | Severe (216) | 100% | p8 | 37 |
| Chief Joseph 17020005 · WA | 1,078 | 52.1 | Severe (215) | — | — | 55 |
| Lower Rogue 17100310 · OR | 168 | 53.2 | Severe (212) | 100% | p12 | 49 |
| Willow 17070104 · OR | 238 | 55.8 | Severe (211) | 67% | p16 | 57 |
| Lower Snake 17060110 · WA | 441 | 47.9 | Severe (209) | — | — | 53 |
| Summer Lake 17120005 · OR | 417 | 46.6 | Severe (208) | — | — | 52 |
| Siuslaw 17100206 · OR | 34 | 51.7 | Severe (208) | 100% | p9 | 39 |
| Silver 17120004 · OR | 293 | 48 | Severe (207) | — | — | 53 |
| Colville 17020003 · WA | 1,873 | 49.6 | Severe (206) | 100% | p10 | 38 |
| Franklin D. Roosevelt Lake 17020001 · CN, WA | 2,197 | 58 | Severe (205) | 100% | p22 | 51 |
| Big Lost 17040218 · ID | 1,868 | 51.4 | Severe (205) | 60% | p23 | 57 |
| Lower Crab 17020015 · WA | 4,216 | 42.2 | Severe (200) | 50% | p52 | 54 |
| Upper Columbia-Priest Rapids 17020016 · WA | 3,393 | 42.6 | Severe (200) | 0% | p75 | 61 |
| Crescent-Hoko 17110021 · CN, WA | 1,298 | 60.8 | Severe (200) | 100% | p11 | 53 |
| Molalla-Pudding 17090009 · OR | 1,190 | 53.4 | Severe (200) | 83% | p8 | 46 |
| Upper Columbia-Entiat 17020010 · WA | 1,036 | 52 | Severe (200) | 100% | p10 | 39 |
| Wenatchee 17020011 · WA | 932 | 57.1 | Severe (200) | 100% | p8 | 41 |
| Warner Lakes 17120007 · CA, NV, OR | 521 | 53.3 | Severe (200) | — | — | 57 |
| Guano 17120008 · NV, OR | 517 | 51.3 | Severe (200) | — | — | 56 |
| Banks Lake 17020014 · WA | 445 | 41.9 | Severe (200) | — | — | 51 |
| Moses Coulee 17020012 · WA | 318 | 47.5 | Severe (200) | — | — | 54 |
| Lake Abert 17120006 · OR | 187 | 57 | Severe (200) | — | — | 59 |
| Beaver-Camas 17040214 · ID, MT | 1,030 | 50.2 | Moderate (199) | 100% | p10 | 49 |
| Illinois 17100311 · CA, OR | 165 | 51.5 | Moderate (199) | 100% | p11 | 46 |
| Dungeness-Elwha 17110020 · CN, WA | 3,681 | 46.7 | Moderate (195) | 100% | p6 | 38 |
| Hood Canal 17110018 · WA | 2,251 | 47.7 | Moderate (194) | 100% | p13 | 43 |
| Teton 17040204 · ID, WY | 830 | 53.1 | Moderate (194) | 50% | p24 | 58 |
| Lower Henrys 17040203 · ID, WY | 749 | 48.9 | Moderate (191) | 86% | p11 | 48 |
| Upper Yakima 17030001 · WA | 5,721 | 53.7 | Moderate (190) | 0% | p33 | 70 |
| Middle Willamette 17090007 · OR | 1,571 | 52 | Moderate (188) | 100% | p16 | 45 |
| South Fork Boise 17050113 · ID | 470 | 63 | Moderate (183) | 50% | p30 | 64 |
| Lower Skagit 17110007 · WA | 1,358 | 53 | Moderate (182) | 100% | p23 | 51 |
| Stillaguamish 17110008 · WA | 2,062 | 51.2 | Moderate (181) | 100% | p7 | 40 |
| Hoh-Quillayute 17100101 · WA | 359 | 46.1 | Moderate (180) | 100% | p15 | 46 |
| Coquille 17100305 · OR | 262 | 57 | Moderate (180) | 100% | p7 | 42 |
| Strait of Georgia 17110002 · CN, WA | 1,583 | 49.3 | Moderate (178) | 50% | p17 | 55 |
| Skykomish 17110009 · WA | 1,402 | 57.1 | Moderate (178) | 80% | p10 | 51 |
| Lower Salmon 17060209 · ID | 252 | 61.3 | Moderate (170) | 100% | p17 | 55 |
| Coos 17100304 · OR | 417 | 45.4 | Moderate (164) | — | — | 56 |
| Boise-Mores 17050112 · ID | 228 | 59.4 | Moderate (164) | 100% | p14 | 50 |
| Lower Columbia-Sandy 17080001 · OR, WA | 2,276 | 52.2 | Moderate (162) | 82% | p8 | 48 |
| Birch 17040216 · ID, MT | 143 | 52.3 | Moderate (161) | — | — | 60 |
| Little Salmon 17060210 · ID | 211 | 57.1 | Moderate (158) | 100% | p9 | 44 |
| Middle Fork Clearwater 17060304 · ID | 53 | 60.5 | Moderate (154) | — | — | 65 |
| Moyie 17010105 · CN, ID, MT | 150 | 62.4 | Moderate (148) | 100% | p9 | 46 |
| Little Lost 17040217 · ID | 382 | 53.3 | Moderate (147) | 100% | p18 | 54 |
| Middle Snake-Payette 17050115 · ID, OR | 168 | 49.1 | Moderate (141) | 100% | p9 | 42 |
| Alsea 17100205 · OR | 35 | 47.5 | Moderate (138) | 50% | p20 | 57 |
| Lower Boise 17050114 · ID | 6,536 | 43.5 | Moderate (131) | 29% | p35 | 63 |
| Chetco 17100312 · CA, OR | 79 | 53.1 | Moderate (131) | 100% | p9 | 44 |
| Yamhill 17090008 · OR | 466 | 48.9 | Moderate (129) | 100% | p8 | 43 |
| Greys-Hoback 17040103 · ID, WY | 571 | 52.9 | Moderate (128) | 25% | p32 | 69 |
| Middle Columbia-Lake Wallula 17070101 · OR, WA | 1,936 | 52.1 | Moderate (126) | — | — | 63 |
| Upper Henrys 17040202 · ID, MT, WY | 579 | 52.9 | Moderate (124) | 100% | p9 | 50 |
| Lower Yakima 17030003 · WA | 10,546 | 45 | Moderate (123) | 67% | p21 | 59 |
| South Fork Clearwater 17060305 · ID | 276 | 61 | Moderate (123) | 100% | p9 | 48 |
| North and Middle Forks Boise 17050111 · ID | 318 | 61.3 | Moderate (119) | — | — | 69 |
| Siletz-Yaquina 17100204 · OR | 80 | 49.6 | Moderate (114) | 100% | p7 | 44 |
| Puget Sound 17110019 · WA | 16,329 | 41.8 | Moderate (113) | 60% | p18 | 56 |
| Middle Columbia-Hood 17070105 · OR, WA | 3,611 | 56.7 | Moderate (113) | 75% | p9 | 54 |
| Payette 17050122 · ID | 503 | 55.6 | Moderate (113) | 100% | p10 | 49 |
| Naches 17030002 · WA | 2,608 | 52.6 | Moderate (112) | 100% | p8 | 46 |
| Snohomish 17110011 · WA | 1,488 | 44.6 | Moderate (111) | 100% | p9 | 48 |
| Snoqualmie 17110010 · WA | 1,600 | 51.1 | Moderate (108) | 100% | p9 | 48 |
| North Fork Payette 17050123 · ID | 520 | 55.5 | Moderate (108) | 50% | p37 | 67 |
| Sixes 17100306 · OR | 164 | 60.2 | Moderate (105) | — | — | 70 |
| Lower Clark Fork 17010213 · ID, MT | 1,031 | 59.1 | Moderate (103) | 80% | p17 | 61 |
| Skokomish 17110017 · WA | 466 | 56.8 | Moderate (103) | 80% | p13 | 57 |
| Lower Willamette 17090012 · OR | 901 | 52.8 | Moderate (102) | 57% | p7 | 59 |
| Queets-Quinault 17100102 · WA | 300 | 42.5 | Moderate (101) | 100% | p9 | 43 |
| Puyallup 17110014 · WA | 4,033 | 48 | Moderate (100) | 93% | p8 | 48 |
| Lake Washington 17110012 · WA | 3,229 | 46 | Moderate (100) | 85% | p9 | 52 |
| Duwamish 17110013 · WA | 2,834 | 44.9 | Moderate (100) | 63% | p17 | 59 |
| Lewis 17080002 · WA | 2,170 | 54.3 | Moderate (100) | 83% | p8 | 52 |
| Klickitat 17070106 · WA | 2,094 | 55.4 | Moderate (100) | 100% | p13 | 53 |
| Tualatin 17090010 · OR | 1,669 | 55.1 | Moderate (100) | 50% | p33 | 68 |
| San Juan Islands 17110003 · CN, WA | 1,412 | 45.2 | Moderate (100) | — | — | 63 |
| Upper Cowlitz 17080004 · WA | 1,086 | 60.8 | Moderate (100) | 100% | p9 | 53 |
| Snake Headwaters 17040101 · WY | 662 | 51.9 | Moderate (100) | 20% | p30 | 72 |
| Gros Ventre 17040102 · WY | 165 | 55.2 | Moderate (100) | 0% | p78 | 73 |
| Middle Fork Payette 17050121 · ID | 123 | 59.3 | Moderate (100) | 100% | p21 | 59 |
| Siltcoos 17100207 · OR | 37 | 45.1 | Moderate (100) | — | — | 63 |
| Nisqually 17110015 · WA | 5,371 | 44.7 | Abnormally dry (98) | 86% | p14 | 53 |
| Lower Cowlitz 17080005 · WA | 3,258 | 54.2 | Abnormally dry (92) | 67% | p15 | 59 |
| Upper North Fork Clearwater 17060307 · ID, MT | 379 | 64 | Abnormally dry (82) | 100% | p9 | 52 |
| Lower Columbia-Clatskanie 17080003 · OR, WA | 3,730 | 49.6 | Abnormally dry (80) | 0% | p45 | 77 |
| South Fork Payette 17050120 · ID | 322 | 57.5 | Abnormally dry (68) | 50% | p38 | 71 |
| South Fork Salmon 17060208 · ID | 272 | 59 | Abnormally dry (62) | 100% | p19 | 62 |
| Wilson-Trusk-Nestuccu 17100203 · OR | 139 | 55.1 | Abnormally dry (48) | 100% | p9 | 54 |
| Nehalem 17100202 · OR | 62 | 53.1 | Abnormally dry (48) | 100% | p8 | 50 |
| Deschutes 17110016 · WA | 1,703 | 43.6 | Abnormally dry (45) | 100% | p9 | 47 |
| Middle Clark Fork 17010204 · ID, MT | 1,082 | 56.7 | Abnormally dry (42) | 25% | p29 | 77 |
| Lower Flathead 17010212 · MT | 1,149 | 50.4 | Abnormally dry (33) | 0% | p40 | 80 |
| Upper Salmon 17060201 · ID | 954 | 56.1 | Abnormally dry (33) | 60% | p24 | 69 |
| Middle Salmon-Chamberlain 17060207 · ID, MT | 345 | 62.7 | Abnormally dry (33) | — | — | 78 |
| Fisher 17010102 · MT | 290 | 62.5 | Abnormally dry (33) | 50% | p21 | 70 |
| Lochsa 17060303 · ID, MT | 322 | 60.2 | Abnormally dry (32) | 100% | p10 | 54 |
| Yaak 17010103 · CN, ID, MT | 203 | 64.5 | Abnormally dry (31) | 100% | p8 | 55 |
| Middle Kootenai 17010101 · CN, ID, MT | 1,227 | 55.3 | Abnormally dry (24) | 0% | p34 | 83 |
| Lower Chehalis 17100104 · WA | 352 | 42.4 | Abnormally dry (21) | 100% | p11 | 54 |
| Grays Harbor 17100105 · WA | 290 | 41.7 | Abnormally dry (21) | 100% | p10 | 59 |
| Lower Selway 17060302 · ID, MT | 259 | 62.9 | Abnormally dry (21) | 100% | p10 | 66 |
| Pahsimeroi 17060202 · ID | 268 | 54.2 | Abnormally dry (7) | 100% | p9 | 53 |
| Upper Chehalis 17100103 · WA | 4,994 | 40.4 | Abnormally dry (5) | 82% | p9 | 57 |
| Bitterroot 17010205 · ID, MT | 1,698 | 55.8 | None (0) | 50% | p27 | 72 |
| Lower Columbia 17080006 · OR, WA | 1,226 | 63 | None (0) | — | — | 82 |
| Upper Clark Fork 17010201 · MT | 1,196 | 50.7 | None (0) | 56% | p21 | 70 |
| Blackfoot 17010203 · MT | 963 | 59.2 | None (0) | 0% | p73 | 84 |
| Flint-Rock 17010202 · MT | 947 | 55.9 | None (0) | 38% | p35 | 77 |
| Flathead Lake 17010208 · MT | 934 | 46.6 | None (0) | 100% | p23 | 62 |
| Willapa Bay 17100106 · OR, WA | 850 | 42.2 | None (0) | 100% | p8 | 50 |
| South Fork Flathead 17010209 · MT | 640 | 61.8 | None (0) | 0% | p58 | 87 |
| North Fork Flathead 17010206 · CN, MT | 551 | 61.9 | None (0) | 100% | p21 | 67 |
| Stillwater 17010210 · MT | 537 | 53.7 | None (0) | 0% | p29 | 84 |
| Middle Fork Flathead 17010207 · MT | 509 | 59.5 | None (0) | 0% | p26 | 86 |
| Upper Middle Fork Salmon 17060205 · ID | 452 | 61.9 | None (0) | 100% | p21 | 67 |
| Middle Salmon-Panther 17060203 · ID, MT | 418 | 61.1 | None (0) | 50% | p27 | 77 |
| Swan 17010211 · MT | 348 | 55.5 | None (0) | 0% | p36 | 84 |
| Lower Middle Fork Salmon 17060206 · ID | 343 | 63.7 | None (0) | 0% | p25 | 87 |
| Lemhi 17060204 · ID, MT | 301 | 56.8 | None (0) | 100% | p15 | 60 |
| Upper Selway 17060301 · ID, MT | 246 | 64.9 | None (0) | — | — | 82 |
| Elk 17010106 · CN, MT | 51 | 60.5 | None (0) | — | — | 80 |
| Necanicum 17100201 · OR | 41 | 46 | None (0) | — | — | 73 |
| Upper Kootenai River 17010108 · CN | 14 | 39 | no data | — | — | 39 |
| Headwaters Columbia River 17020017 · CN | 8 | 39 | no data | — | — | 39 |
| Upper Arrow Lake-Columbia River 17020021 · CN | 8 | 39 | no data | — | — | 39 |
| Canoe River-McNaughton Lake 17020018 · CN | 2 | 39 | no data | — | — | 39 |
| Goldstream River-Columbia River 17020020 · CN | 2 | 39 | no data | — | — | 39 |
| Slocan River 17010110 · CN | 1 | 39 | no data | — | — | 39 |
| Headwaters Kootenai River 17010107 · CN | 0 | — | no data | — | — | — |
| Duncan River 17010109 · CN | 0 | — | no data | — | — | — |
| McNaughton Lake-Columbia River 17020019 · CN | 0 | — | no data | — | — | — |
Top water assets in this region
- 97Opal SpringsTrout
- 94Snake River Artesian Belt — Deep AquiferUpper Snake-Rock
- 83Snake River Plain Deep Basalt Fossil AquiferLake Walcott
- 80036 N39 E52 10Cbac1South Fork Owyhee
- 80Columbia Plateau Deep Basalt Fossil Aquifer — Central WashingtonLower Crab
- 80Columbia Plateau Basalt Aquifer — Wahluke SlopeLower Crab
- 78South Fork Of 12 Mile Creek — IrrigationBeaver-South Fork
- 78George Creek — IsRaft
- 78West Branch George Creek — IsRaft
- 78East Fork Silvies River — IrrigationSilvies