River Summary
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SRAK48 PACR 240005
RVAAK
AKZALL-232200-

ALASKA SPRING BREAKUP SUMMARY
NWS ALASKA PACIFIC RIVER FORECAST CENTER ANCHORAGE AK
4 PM AKDT May 23 2018

...SPRING BREAKUP SUMMARY FOR ALASKA....

FLOOD WARNING/WATCHES:
None at this time.

ALASKA BREAKUP SUMMARY NOTABLE EVENTS FROM PAST 24 HOURS -

Breakup on the north slope is proceeding slowly. Temperatures are on the cool
side and water levels remain low. Water on the Colville River is begining to
rise along the lower reach near Nuiqsuit. Channel ice on the Colville River is
still intack along the lower reach. Flow on the Sag River was down slightly
today as compare to yesterday based on manual measurements.

STATEWIDE BREAKUP FLOOD POTENTIAL FORECAST-

The flood potential from snowmelt and ice jams throughout most of Alaska this
spring is currently rated as low to low-moderate indicating that locations
that often experience flooding during breakup may see minor flooding if an ice
jam forms downstream. The central Tanana Valley has a higher risk of minor
flooding this spring due to a greater than normal winter snowpack.

WEATHER - North Slope temperatures are expected to be in the 20s and below
average for through Saturday and then varying between normal and above normal
temperatures for the next few weeks.

Recent Breakup Activity Across the State:

 **********************************************************************
 * EVEN THOUGH A PARTICULAR RIVER OR REACH MAY BE DESCRIBED AS MOSTLY *
 * OPEN OR OPEN... IT IS STILL POSSIBLE FOR RUNS OF ICE AND DEBRIS TO *
 * MOVE THROUGH AS HEADWATERS UPSTREAM BREAKUP.  PLEASE USE CAUTION AT*
 * ALL TIMES WHEN ATTEMPTING TO NAVIGATE RIVERS.                      *
 **********************************************************************

SUSITNA RIVER...
(5/14) Water receded in ice jam at Curry, leaving large ice chunks behind.
More ice may be upstream.
(5/12) Ice jam flooding reported on the railroad track near Curry.
(5/5) The Susitna River at the Parks Highway is opening up.
(5/3) The Susitna River at Deshka Landing broke up last night with some minor
ice jams.
(5/2) Talkeetna River near Talkeetna is open while shore ice remains.
The Chulitna River at the Susitna River confluence is ice free. River levels
are reported to be low. Tributaries draining the Talkeenta Mountains including
the Little Susitna, Willow, Montana Creek at the Parks Highway are mostly
ice free.

SKWENTNA AND YENTNA RIVER..
(5/4) The Skwentna River at Skwentna is ice free. (5/3) River ice on the
Skwentna and Yentna rivers broke up last night. Ice floes continue along
these rivers.

COPPER RIVER..
(5/2) An open lead has formed on the Gulkana and Gakona rivers at the
Richardson Highway bridges. An open channel has formed along the Copper River.

TANANA RIVER..
(5/7) The Tanana River is open

KUSKOKWIM...
(5/9) The Kuskokwim River is open

YUKON RIVER...
(5/20) The Yukon was reported ice free as far down as Galena Sunday morning.
Satellite images showed that the Porcupine River is open or mostly open upstream
of Old Crow down to the mouth. FAA webcams showed some ice still passing by
Grayling on Sunday morning.
(5/19) Ice started flowing by Emmonak and Alakanuk on Friday afternoon. River
levels came up but are still low and ice is flowing freely to the ocean. Ice
was still passing the webcam in Grayling but in Tanana, very little ice was left
in the river although there were quite a few logs and sticks floating
downstream. Galena reported no ice left in the river but a normal amount of
drift for this time of year.
(5/18) Ice still intact at Emmonak
(5/17) Ice is flowing at Marshall and water rose about four to five feet, but
about 20-feet below bankfull. Ice moving past Russian Mission and Pilot Station.
River at Mountain Village is open with no ice floeing. Ice still in place at
Alakanuk/Emmonak but very black/rotten.
(5/16) Very little ice passing Ruby now.
(5/15) Ice started running by Grayling and Anvik on Tuesday afternoon
(5/13) Breakup has continued downstream to Koyukuk and Nulato. Ice shifted at
Mt Village.
(5/12) Yukon River at Ruby and Galena is open now. Breakup occurred at Beaver.
(5/11) Ice began running and subsequently broke up at Stevens Village.
(5/5) Yukon River at Dawson has begun to open up and the Klondike River ice
has moved out. At Eagle, the Yukon River ice is rotten and is free from the
river banks. Ice on the Forty Mile River has pushed out to near the confluence
with the Yukon River.

KOYUKUK RIVER...
(5/17) At Huslia ice went out on 5/13 and chunk ice was still floating by on
5/16.
(5/11) Ice went out at Bettles, Allakaket, and Hughes.

KOBUK RIVER...
(5/17) Ice went out at Kobuk about 5/11 with very few chunks flowing. Ice went
out at Ambler and Shugnak on 5/16 but continues to run with water rising
some but still about 6 to 10 feet below bankfull.

NOATAK RIVER...
(5/17) Ice is out at Noatak. Based on a pilot report this was a local movement
and there is still significant in-place ice upstream of the village of Noatak.

BROOKS RANGE - NORTH...
(5/23) Water on the Colville River is begining to rise along the lower reach
near Nuiqsuit. Channel ice on the Colville River is still intack along the
lower reach. Flow on the Sag River was down slightly today as compare to
yesterday based on manual measurements.
(5/21) Based on photos from USGS and webcam images breakup is beginning on the
north slope. Some water has moved down the Colville as far as Colville Village
but so far progress is slow and water levels are relatively low.
(5/20) Water is progressing on top of ice towards the Arctic Ocean on the north
slope rivers such as the Colville and Kuparuk.
(5/16) An open lead has formed along the Sagavanirktok River along the Dalton
Highway.

For more detail and to see a flood potential map refer to our web
site at https://www.weather.gov/aprfc/floodpotential


---------------------------------------------------------------------
Snowmelt runoff volume: expected water volume from snowmelt during
the melt season.

Flood potential: the likelihood of flooding from snowmelt and/or
ice jams. This is initially calculated based on the flood frequency
for the 2000 to 2017 historical record and adjusted to reflect
current conditions.

* average (median) breakup dates are for the period 1980 through
2017 and are calculated for locations with at least 5 years of data.
** actual breakup date for this year


---------------------------------------------------------------------

                      SNOWMELT    FLOOD     AVERAGE  NO. OF  FORECAST
RIVER - REACH          RUNOFF    POTENTIAL  BREAKUP  YEARS   BREAKUP
                       VOLUME                DATE*    USED    DATE
-------------         ---------- ---------  -------  ------  --------
SOUTHEAST PANHANDLE      BELOW

KENAI RIVER              BELOW    LOW

ANCHOR RIVER             BELOW    LOW

MATANUSKA RIVER         AVERAGE   LOW

SUSITNA RIVER           AVERAGE
  GOLD CREEK                      LOW
  SUNSHINE                        LOW        05/03     29    **05/04

YENTNA RIVER             BELOW
  LAKE CREEK                      LOW        05/01     27    **05/03

SKWENTNA RIVER           BELOW
  SKWENTNA                        LOW        04/30     23    **05/03

COPPER RIVER BASIN   ABOVE AVERAGE
  GAKONA RVR @ HWY                LOW        04/30     30    **05/06
  GULKANA RVR @ HWY               LOW        04/30     29    **05/06

CHENA RIVER          ABOVE AVERAGE
  CHENA LAKES PROJECT
  FAIRBANKS                       LOW        04/26     26

TANANA RIVER         ABOVE AVERAGE
  CHISANA @ NORTHWAY              LOW        04/26     27    **04/25
  SALCHA                          LOW
  FAIRBANKS                       LOW        04/29     19    **04/27
  NENANA                          LOW        04/30     38    **05/01
  MANLEY                          LOW        05/03     27    **05/07

KUSKOKWIM RIVER        AVERAGE
  NIKOLAI                         LOW        04/23     32    **04/24
  MCGRATH                       LOW-MOD      05/04     38    **05/09
  STONY RIVER                     LOW        05/02     30    **05/02
  SLEETMUTE                     LOW-MOD      05/02     29    **04/29
  RED DEVIL                     LOW-MOD      05/04     32    **04/29
  CROOKED CREEK                 LOW-MOD      05/05     32    **04/30
  ANIAK                         LOW-MOD      05/07     35    **05/01
  KALSKAG                         LOW        05/07     29    **05/05
  TULUKSAK                        LOW        05/07     26    **05/04
  AKIAK                           LOW        05/09     32    **05/04
  KWETHLUK                      LOW-MOD      05/10      6    **04/30
  BETHEL                          LOW        05/10     38    **05/03
  NAPAKIAK                        LOW        05/11     23    **05/05

YUKON RIVER (UPPER)    AVERAGE
  DAWSON, YT                      LOW        05/04     38    **05/08
  EAGLE                           LOW        05/04     37    **05/08
  CIRCLE                        LOW-MOD      05/08     34    **05/10
  FORT YUKON                      LOW        05/10     34    **05/11
  BEAVER                          LOW        05/10     22    **05/12
  STEVENS VILLAGE                 LOW        05/11     21    **05/11
  RAMPART                         LOW        05/11     23    **05/12

YUKON RIVER (MIDDLE) ABOVE AVERAGE
  TANANA                          LOW        05/08     33    **05/07
  RUBY                            LOW        05/09     32    **05/12
  GALENA                        LOW-MOD      05/11     37    **05/12
  KOYUKUK                       LOW-MOD      05/10     13    **05/13
  NULATO                        LOW-MOD      05/10     22    **05/13
  KALTAG                          LOW        05/12     32    **05/14
  ANVIK                           LOW        05/14     31    **05/15

YUKON RIVER (LOWER)  ABOVE AVERAGE
  HOLY CROSS                      LOW        05/15     31    **05/16
  RUSSIAN MISSION                 LOW        05/16     32    **05/14
  MARSHALL                      LOW-MOD      05/15     26    **05/15
  PILOT STATION                   LOW        05/15     21    **05/13
  MOUNTAIN VILLAGE                LOW        05/19     31    **05/14
  ALAKANUK/EMMONAK              LOW-MOD      05/21     32    **05/18

KOYUKUK RIVER       ABOVE AVERAGE
  BETTLES                         LOW        05/09     36    **05/11
  ALLAKAKET                       LOW        05/09     32    **05/11
  HUGHES                        LOW-MOD      05/11     31    **05/11

SEWARD PENINSULA    ABOVE AVERAGE
  BUCKLAND                      LOW-MOD      05/20     28    **05/12

KOBUK RIVER         ABOVE AVERAGE
  KOBUK                         LOW-MOD      05/14     34    **05/11
  SHUNGNAK                        LOW        05/17     28    **05/16
  AMBLER                          LOW        05/17     34    **05/16

NOATAK RIVER        ABOVE AVERAGE
  NOATAK                          LOW        05/19     22    **05/15

BROOKS RANGE - NORTH  AVERAGE
  COLVILLE @ UMIAT                LOW        05/25     18  05/23-05/29
  COLVILLE @ COLVILLE VILLAGE     LOW        06/03     20  05/31-06/05

SAGAVANIRKTOK RIVER   AVERAGE
  DALTON HWY                      LOW

The next Spring Breakup Summary is scheduled at 2 pm AKDT Wednesday, May 23,
2018

$$
SDL


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