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United States Natural Resources Water and Climate Center
Department of Conservation Portland, Oregon
Agriculture Service
S N O W - P R E C I P I T A T I O N U P D A T E
Based on Mountain Data from NRCS SNOTEL Sites
As of TUESDAY: FEBRUARY 6 , 2018
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STATE PERCENT OF Normal
RIVER BASIN Number Snow Water Accum
of Sites Equivalent Precip
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ALASKA
ANCHORAGE/SHIP CREEK BASIN ................... 4 of 4 42 78
SUSITNA BASIN ................................ 3 of 5 74 114
NORTHERN KENAI MOUNTAINS ..................... 7 of 7 50 92
SOUTHERN KENAI ............................... 3 of 6 68 100
COPPER BASIN ................................. 1 of 3 * *
PRINCE WILLIAM SOUND ......................... 1 of 7 * 110
CHENA BASIN .................................. 6 of 7 158 160
UPPER TANANA ................................. 2 of 5 * *
KOYUKUK BASIN ................................ 2 of 6 * 97
CENTRAL YUKON BASIN .......................... 0 of 5 * 140
NORTON SOUND ................................. 0 of 4 * 151
KUPARUK-SAGAVANIRKTOK RIVER BASIN ............ 0 of 3 * 117
NORTHWEST ARCTIC RIVER BASIN ................. 0 of 1 * *
SOUTHEAST ALASKA BASIN ....................... 1 of 3 * 77
ARIZONA
VERDE RIVER BASIN ............................ 5 of 10 10 17
SAN FRANCISCO PEAKS .......................... 1 of 1 27 20
CENTRAL MOGOLLON RIM ......................... 3 of 4 8 15
LITTLE COLORADO - SOUTHERN HEADWATERS ........ 5 of 6 7 15
UPPER SALT RIVER BASIN / WHITE MOUNTAINS ..... 7 of 9 5 13
SAN FRANCISCO / UPPER GILA RIVER BASIN ....... 7 of 8 8 14
CHUSKA MOUNTAINS ............................. 0 of 2 * *
CALIFORNIA
NORTHERN GREAT BASIN ......................... 4 of 5 52 68
TRUCKEE RIVER ................................ 7 of 9 44 75
LAKE TAHOE ................................... 7 of 8 28 77
CARSON RIVER ................................. 8 of 9 37 61
WALKER RIVER ................................. 7 of 7 40 61
KLAMATH ...................................... 14 of 18 34 72
COLORADO
GUNNISON RIVER BASIN ......................... 12 of 16 48 45
UPPER COLORADO RIVER BASIN ................... 27 of 31 79 78
SOUTH PLATTE RIVER BASIN ..................... 16 of 22 94 107
LARAMIE AND NORTH PLATTE RIVER BASINS ........ 12 of 12 88 97
YAMPA AND WHITE RIVER BASINS ................. 19 of 20 77 75
ARKANSAS RIVER BASIN ......................... 6 of 9 56 59
UPPER RIO GRANDE BASIN ....................... 11 of 16 33 36
SAN MIGUEL, DOLORES, ANIMAS
AND SAN JUAN RIVER BASIN .................. 17 of 19 35 30
IDAHO
NORTHERN PANHANDLE REGION .................... 9 of 10 109 114
SPOKANE RIVER BASIN .......................... 10 of 10 106 117
CLEARWATER BASIN ............................. 13 of 16 118 124
SALMON BASIN ................................. 22 of 22 104 99
WEISER BASIN ................................. 4 of 4 57 82
PAYETTE BASIN ................................ 11 of 11 83 91
BOISE BASIN .................................. 9 of 10 70 89
BIG WOOD BASIN ............................... 8 of 9 74 83
LITTLE WOOD BASIN ............................ 5 of 5 74 86
BIG LOST BASIN ............................... 5 of 5 86 90
LITTLE LOST, BIRCH BASINS .................... 4 of 4 106 92
MEDICINE LODGE, BEAVER, CAMAS BASINS ......... 4 of 4 95 84
HENRYS FORK, TETON BASINS .................... 8 of 8 113 101
SNAKE BASIN ABOVE PALISADES .................. 18 of 18 121 107
WILLOW, BLACKFOOT, PORTNEUF BASINS ........... 5 of 6 71 82
SNAKE BASIN ABOVE AMERICAN FALLS ............. 28 of 29 113 101
RAFT BASIN ................................... 1 of 2 85 78
GOOSE CREEK BASIN ............................ 2 of 2 60 77
SALMON FALLS BASIN ........................... 5 of 5 61 80
BRUNEAU BASIN ................................ 5 of 5 54 80
OWYHEE BASIN ................................. 6 of 8 37 80
BEAR RIVER BASIN ............................. 14 of 15 83 79
MONTANA
KOOTENAI RIVER BASIN ......................... 8 of 8 119 115
FLATHEAD RIVER BASIN ......................... 11 of 16 137 131
UPPER CLARK FORK RIVER BASIN ................. 13 of 15 156 135
BITTERROOT RIVER BASIN ....................... 7 of 7 133 123
LOWER CLARK FORK RIVER BASIN ................. 8 of 8 121 120
JEFFERSON RIVER BASIN ........................ 19 of 19 134 107
MADISON RIVER BASIN .......................... 11 of 11 122 107
GALLATIN RIVER BASIN ......................... 7 of 7 140 126
MISSOURI HEADWATERS .......................... 31 of 31 131 111
HEADWATERS MISSOURI MAINSTEM ................. 5 of 5 157 132
SMITH, JUDITH, AND MUSSELSHELL RIVER BASINS .. 9 of 10 137 118
SUN, TETON AND MARIAS RIVER BASINS ........... 4 of 6 140 134
MISSOURI MAINSTEM RIVER BASIN ................ 18 of 21 143 128
ST. MARY AND MILK RIVER BASINS ............... 3 of 3 118 129
UPPER YELLOWSTONE RIVER BASIN ................ 22 of 24 162 140
WIND RIVER BASIN (WYOMING) ................... 10 of 13 125 109
SHOSHONE RIVER BASIN (WYOMING) ............... 4 of 6 153 146
BIGHORN RIVER BASIN (WYOMING) ................ 14 of 16 147 123
TONGUE RIVER BASIN (WYOMING) ................. 6 of 7 106 77
POWDER RIVER BASIN (WYOMING) ................. 6 of 7 133 105
LOWER YELLOWSTONE RIVER BASIN ................ 29 of 35 131 109
NEVADA
NORTHERN GREAT BASIN ......................... 7 of 9 43 74
SNAKE RIVER .................................. 7 of 10 56 79
OWYHEE RIVER ................................. 5 of 5 39 81
UPPER HUMBOLDT RIVER ......................... 9 of 9 40 71
LOWER HUMBOLDT RIVER ......................... 5 of 9 33 72
CLOVER VALLEY & FRANKLIN RIVER ............... 4 of 6 39 68
EASTERN NEVADA BASINS ........................ 4 of 4 37 42
NEW MEXICO
RIO CHAMA RIVER BASIN ........................ 2 of 4 30 38
UPPER RIO GRANDE BASIN ....................... 9 of 9 32 33
SANGRE DE CRISTO MOUNTAIN RANGE BASINS ....... 8 of 11 21 43
JEMEZ RIVER BASIN ............................ 3 of 3 17 21
SAN FRANCISCO RIVER BASIN .................... 3 of 3 12 13
GILA RIVER BASIN ............................. 3 of 3 11 15
MIMBRES RIVER BASIN .......................... 2 of 2 3 14
PECOS RIVER BASIN ............................ 1 of 1 3 27
SAN JUAN RIVER HEADWATERS .................... 5 of 5 33 27
ANIMAS RIVER BASIN ........................... 7 of 7 34 27
CIMARRON RIVER BASIN ......................... 2 of 2 5 31
ZUNI/BLUEWATER RIVER BASIN ................... 0 of 1 * 6
RIO HONDO BASIN .............................. 1 of 1 2 36
CHUSKA MOUNTAINS ............................. 0 of 1 * *
OREGON
OWYHEE ....................................... 6 of 8 37 80
MALHEUR ...................................... 3 of 3 40 81
GRANDE RONDE, POWDER, BURNT, IMNAHA .......... 14 of 17 65 98
UMATILLA, WALLA WALLA, WILLOW ................ 6 of 8 56 110
JOHN DAY ..................................... 12 of 13 44 80
UPPER DESCHUTES, CROOKED ..................... 13 of 14 43 82
HOOD, SANDY, LOWER DESCHUTES ................. 6 of 8 51 105
COAST RANGE .................................. 1 of 2 * 108
WILLAMETTE ................................... 18 of 23 39 93
ROGUE, UMPQUA ................................ 10 of 12 40 74
KLAMATH ...................................... 14 of 18 34 72
LAKE COUNTY, GOOSE LAKE ...................... 9 of 9 42 73
HARNEY ....................................... 9 of 9 41 73
UTAH
RAFT RIVER ................................... 1 of 2 85 78
BEAR RIVER ................................... 17 of 24 81 78
WEBER-OGDEN RIVERS ........................... 17 of 20 56 61
PROVO R.-UTAH LAKE-JORDAN R. ................. 15 of 17 51 53
TOOELE VALLEY-VERNON CREEK ................... 3 of 4 46 47
NORTHEASTERN UINTAHS ......................... 6 of 10 84 71
DUCHESNE RIVER ............................... 12 of 13 56 56
PRICE-SAN RAFAEL ............................. 6 of 11 37 50
DIRTY DEVIL .................................. 3 of 6 41 46
SOUTH EASTERN UTAH ........................... 3 of 6 36 31
UPPER SEVIER RIVER ........................... 12 of 17 44 44
SAN PITCH RIVER .............................. 5 of 11 * *
LOWER SEVIER RIVER ........................... 1 of 3 * *
BEAVER RIVER ................................. 2 of 2 29 31
ESCALANTE RIVER .............................. 3 of 4 34 36
SOUTHWESTERN UTAH ............................ 10 of 13 32 34
WASHINGTON
NORTHERN PANHANDLE ........................... 9 of 10 109 114
SPOKANE ...................................... 10 of 10 106 117
UPPER COLUMBIA ............................... 5 of 6 130 114
CENTRAL COLUMBIA ............................. 7 of 8 104 115
UPPER YAKIMA ................................. 4 of 5 91 111
LOWER YAKIMA ................................. 7 of 9 93 115
LOWER SNAKE .................................. 17 of 22 106 116
LOWER COLUMBIA ............................... 16 of 22 85 112
SOUTH PUGET SOUND ............................ 6 of 10 78 122
CENTRAL PUGET SOUND .......................... 9 of 9 89 121
NORTH PUGET SOUND ............................ 7 of 12 114 119
OLYMPIC ...................................... 2 of 4 123 112
WYOMING
SNAKE RIVER .................................. 19 of 20 123 107
MADISON-GALLATIN ............................. 5 of 5 121 107
YELLOWSTONE .................................. 13 of 13 162 140
WIND RIVER ................................... 10 of 12 125 109
BIGHORN BASIN ................................ 10 of 11 142 104
SHOSHONE RIVER ............................... 3 of 5 163 154
POWDER RIVER ................................. 6 of 7 133 105
TONGUE RIVER ................................. 6 of 7 106 77
BELLE FOURCHE ................................ 1 of 1 126 103
CHEYENNE RIVER BASIN ......................... 2 of 2 111 90
UPPER N. PLATTE .............................. 16 of 18 88 91
SWEETWATER ................................... 3 of 3 82 64
LOWER N. PLATTE .............................. 4 of 4 80 81
LARAMIE RIVER ................................ 5 of 6 106 115
S. PLATTE .................................... 2 of 3 91 118
LITTLE SNAKE RIVER ........................... 8 of 8 76 76
UPPER GREEN RIVER ............................ 12 of 13 125 110
LOWER GREEN RIVER ............................ 7 of 11 90 77
UPPER BEAR RIVER ............................. 7 of 9 82 74
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The Snow Water Equivalent Percent of Median represents the snow
water equivalent found at selected SNOTEL sites in or near the
basin compared to the Median value for those sites on this day.
The Accumulated Precipitation Percent of Average represents the
total precipitation (beginning October 1st) found at selected
SNOTEL sites in or near the basin compared to the Average value
for those sites on this day.
* = Data are not available or data may not provide a valid measure
of conditions for over half of the sites within the basin.
Refer to the individual state reports for a complete data
listing and basin analysis.
Units = inches for the Current and Normal Snow Water Equivalent and
Total Precipitation values
Medians and averages are calculated for the period 1981-2010.
Provisional data, subject to revision.
* Site -- Either: (a) the current value is missing; (b) the median or
average for the day is not available or is zero; or (c) for snow water
equivalent, the median for the day is less than 10% of the maximum
median value for the year.
* Basin - More than half of the sites within the basin are flagged with *,
preventing the calculation of a meaningful basin index.
The basin index is calculated as the sum of the valid current values
divided by the sum of the corresponding medians (for snow water equivalent)
or averages (for precipitation) and the resulting fraction multiplied by 100.
Western Regional Climate Center