074 

SRUS46 KPQR 181430

RVMPQR



Hydrologic Statement 

National Weather Service Portland OR

730 AM PDT Mon May 18 2026



WAZ040-18730-

730 AM PDT Mon May 18 2026



Current status of reservoirs on the Lewis River, updated 730 AM

Mon, May 18 2026.



RESERVOIR        CURRENT POOL ELEV      FULL POOL

Swift Reservoir         996              1000 FT

Yale Lake               479               490 FT

Lake Merwin             236               240 FT



As of 730 AM PDT, Mon May 18, 2026, the remaining aggregate

storage for refill at Merwin, Yale, and Swift reservoirs is

19 feet.

 

This product is updated hourly on the NWS Portland webpage at:

www.wrh.noaa.gov/total_forecast/getprod.php?wfo=pqr&sid=PQR&pil=RVM

or 

http://go.usa.gov/x97zc

 

Additional hydrologic information can be viewed at:

water.weather.gov/ahps2/index.php?wfo=pqr



$$








726 

SRUS43 KKRF 181445

RVMKRF

 

RESERVOIR DATA

NWS Missouri Basin River Forecast Center Pleasant Hill MO 

1445Z Mon May 18 2026

 

U.S. Army Corps of Engineers - Omaha District 

and U.S. Bureau of Reclamation Reservoir Data 

 

 

:data date/time is 05-18-2026 00:00 



.B KRF 20260518 C DH00/HP/QID/QTD

:

:LID    Reservoir           Pool Elev    Inflow      Outflow

:                           Feet MSL     KCFS        KCFS

TBRM8 : Tiber Dam         :  2989.84  /   1.468  /    0.525 

CLKM8 : Clark Canyon Dam  :  5530.02  /   0.073  /    0.509 

CYNM8 : Canyon Ferry Dam  :  3787.32  /   6.392  /    3.396 

SBDW4 : Boysen Dam        :  4711.75  /   1.649  /    1.215 

CDYW4 : Buffalo Bill Dam  :  5367.43  /   2.797  /    2.055 

BHRM8 : Yellowtail Dam    :  3615.56  /   2.544  /    1.828 

JMDN8 : Jamestown Dam     :  1430.47  /   0.265  /    0.152 

GLUN8 : Heart Butte Dam   :  2062.97  /   0.137  /    0.017 

KEYW4 : Keyhole Dam       :  4088.80  /  -0.120  /    0.000 

PACS2 : Pactola Dam       :  4569.40  /   0.019  /    0.080 

SHAS2 : Shadehill Dam     :  2268.26  /   0.091  /    0.023 

GLEW4 : Glendo Dam        :  4625.01  /   0.471  /    0.023 

BWNN8 : Bowman-Haley Dam  :  2750.50  /   0.000  /    0.000 

JAMN8 : Pipestem Dam      :  1460.40  /  -0.078  /    0.115 

CFDC2 : Chatfield Dam     :  5435.63  /   0.002  /    0.006 

EGDC2 : Cherry Creek Dam  :  5547.46  /   0.023  /    0.038 

BCDC2 : Bear Creek Dam    :  5551.24  /   0.006  /    0.006 

.END

 

 

:END OF MESSAGE

 



$$










727 

SRUS43 KKRF 181445

RVMKRF

 

RESERVOIR DATA

NWS Missouri Basin River Forecast Center Pleasant Hill MO 

1445Z Mon May 18 2026

 

U.S. Army Corps of Engineers 

Missouri Mainstem Reservoir Data 

 

 

:data date/time is 05-18-2026 00:00 



.B KRF 20260518 C DH00/HP/QID/QTD

:

:LID    Reservoir           Pool Elev    Inflow      Outflow

:                           Feet MSL     KCFS        KCFS

FPKM8 : Fort Peck Dam     :  2222.95  /   6.000  /    6.300 

GARN8 : Garrison Dam      :  1826.63  /  16.000  /   18.400 

PIES2 : Oahe Dam          :  1599.30  /  20.000  /   22.100 

BBDS2 : Big Bend Dam      :  1421.08  /  28.000  /   13.000 

FRDS2 : Fort Randall Dam  :  1355.01  /  27.000  /   22.400 

GPDN1 : Gavins Point Dam  :  1206.29  /  24.000  /   24.000 

.END

 

 

:END OF MESSAGE

 



$$










857 

SRUS43 KKRF 181446

RVMKRF



RESERVOIR DATA

NWS Missouri Basin River Forecast Center Pleasant Hill MO

1445Z Mon May 18 2026



U.S. Army Corps of Engineers - Omaha District

Missouri Mainstem Reservoir Data



:data date/time is 05-18-2026 00:00

:This overwrites the previous 06z time with 12z



.A BWNN8 20260518 Z DH120000/HPIRZ   2750.50





:END OF MESSAGE



$$