Flood Potential Outlook
Issued by NWS Denver/Boulder, CO

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COC001-005-013-014-019-031-035-039-047-049-057-059-069-073-075-087-
093-095-115-117-121-123-220000-

Water Supply Outlook
National Weather Service Denver/Boulder CO
522 PM MDT Mon May 7 2018

...Water Supply Outlook for north central and northeast Colorado as
of May 2018...

The latest streamflow volume forecasts are based on May 1st
conditions. The north central Colorado mountain snowpack was 76
percent of normal in the upper Colorado River basin, 81 percent of
normal in the South Platte basin, and 92 percent of normal in the
North Platte basin on May 1st. East of the Continental Divide the
snowpack ranged from 60 percent of normal in the Saint Vrain Creek
drainage to 99 percent of normal in the Cache La Poudre River
watershed. Sub-basin snowpack in Summit and Grand Counties varied
from 74 percent of normal in the Williams Fork basin to 109 percent
of normal in the Muddy Creek drainage. The mountains in northern
Colorado continue to hold substantially more snow than the southern
half of the state.

Combined storage remained at 118 percent of average in the upper
Colorado River basin, and fell slightly to 105 percent of average in
the South Platte basin on May 1st. Two thirds of the U.S. Geological
Survey stream gages continued to record near to above normal flows.
Streamflow volume forecasts are generally below to much below
average with the exception of the North Platte basin in extreme
north central Colorado.
                                       Median Forecast
                                      Volume      Percent
Stream and Station         Period     1000 AF      of Avg
__________________         ______     _______     _______
South Platte River
 Antero Reservoir inflow   May-Sep       5          33
 Spinney Mtn Res inflow    May-Sep      24          45
 11-Mile Canyon Res inflow May-Sep      25          43
 Cheesman Lake inflow      May-Sep      48          45
 South Platte              May-Sep      95          50

Bear Creek
 Morrison                  May-Sep       8          49

Clear Creek
 Golden                    May-Sep      75          71

Saint Vrain Creek
 Lyons                     May-Sep      54          58

Boulder Creek
 Orodell                   May-Sep      32          64

South Boulder Creek
 Eldorado Springs          May-Sep      20          58

Cache La Poudre River
 Canyon Mouth              May-Sep     184          94

North Platte River
 Northgate                 May-Sep     227         120

Colorado River
 Granby                    May-Jul     172          84

Willow Creek
 Willow Creek Res          May-Jul      35          81

Fraser River
 Winter Park               May-Jul      17.3        93

Williams Fork River
 Williams Fork Reservoir   May-Jul      72          80

Blue River
 Dillon Res                May-Jul     129          84
 Green Mtn Res             May-Jul     205          80

Muddy Creek
 Wolford Mtn Res Blw       May-Jul      28          61

Colorado River
 Kremmling                 May-Jul     630          80

These forecasts reflect natural flow only. Actual observed flow will
likely be affected by upstream water management.

Additional supportive information
- Visit the Missouri Basin RFC information webpage for water supply
forecasts east of the divide at weather.gov/mbrfc/water.
- Visit the Colorado Basin RFC for water supply forecasts west of
the divide at cbrfc.noaa.gov/lmap/lmap.php?interface=wsup.
- Visit our website at weather.gov/bou for additional local
weather...climate and stream information.
- Long range precipitation and temperature outlooks are available at
www.cpc.ncep.noaa.gov/products/predictions/.
- Snowpack and reservoir data are available from the Natural
Resources Conservation Service at www.wcc.nrcs.usda.gov/snow/.

$$
tlh



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