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Berthoud Pass CODOS Site


Elevation: 11,300'
Latitude: 39°48'11.91"N
Longitude: 105°46'39.23"W
Slope: 4°    Aspect: ESE
Adjoining Watershed: Fraser River
Associated Snotel: Berthoud Summit

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Berthoud Pass CODOS Site


Elevation: 11,300'
Latitude: 39°48'11.91"N
Longitude: 105°46'39.23"W
Slope: 4°    Aspect: ESE
Adjoining Watershed: Fraser River
Associated Snotel: Berthoud Summit

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Dust Enhanced Runoff Classification


Dust Enhanced Runoff Classification


CODOS has now observed eleven seasons of dust-enhanced snowmelt runoff behavior throughout the Colorado mountains (WY 2006-2017).  Hydrographs at headwater stream gauges have been evaluated and classified within the framework of this dust enhanced snowmelt runoff space utilizing a 3 x 3 x 3 cell matrix corresponding to general characterizations of SWE, dust intensity, and spring weather, as shown in this figure.

 

A conceptual dust enhanced snowmelt runoff model integrating the interactions of March 1 SWE, dust intensity, and spring precipitation.

 

Water Years 2006-2017 have been analyzed and classified for the following stream gauge associated with the Berthoud Pass CODOS site:

For a detailed discussion of this approach, see the state-wide Dust Enhanced Runoff Classification section

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March, April, May Precipitation


March, April, May Precipitation


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SWE Plots


for Berthoud Pass CODOS Site

SWE Plots


for Berthoud Pass CODOS Site

The first nine plots below show a single Water Year's SWE relative to the site's historical record (1971 - current). The last two plots compare SWE and Dust on Snow events for two consecutive years. The shaded bands represent non-exceedence percentiles in the following order (from the bottom up):

  • Minimum - 10th percentile (dark gray)
  • 10th - 30th percentiles  (medium gray)
  • 30th - 70th percentiles  (light gray) with 50% trace in the middle
  • 70th - 90th percentiles  (medium gray)
  • 90th - maximum (dark gray)

For a more detailed explanation, see http://www.wrcc.dri.edu/spi/explanation.html

 
 
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Snowmelt Rates


for Berthoud Pass CODOS Site

Snowmelt Rates


for Berthoud Pass CODOS Site

Analysis of Berthoud Summit Snotel data for Water Years 2006-2017 snowmelt seasons showing date and quantity of peak SWE, days from peak SWE to “snow all gone” (SAG), total additional precipitation after the date of peak SWE, an “adjusted” mean daily rate of snowmelt adding the additional precipitation to the peak SWE total, the maximum five-day moving average of daily melt, and the mean air temperature over the entire snowmelt period, from peak SWE to SAG.  POR refers to the snotel's entire period of record. The Berthoud Summit Snotel site experiences very good solar access, with no shading from the east, south, or west.  This site is unique in this regard, among the CODOS Snotel sites, and snowmelt rates at this site most fully reflect the impacts of direct solar (radiative) forcing in dust-in-snow.


Our Snowmelt Excel Workbook Berthoud Summit contains spreadsheets for each year, including a summary aggregating all years. See our Snotel Dataset page for downloadable Excel files for each CODOS site, and an "All CODOS Sites Aggregated" Excel workbook containing spreadsheets for Water Years 2006-2017 and a summary of all years combined.

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Hydrographs


for Berthoud Pass CODOS Site

Hydrographs


for Berthoud Pass CODOS Site

 
 
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Snow Profiles


for Berthoud Pass CODOS Site

Snow Profiles


for Berthoud Pass CODOS Site

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Photo Gallery


for Berthoud Pass CODOS Site

Photo Gallery


for Berthoud Pass CODOS Site

Dust-on-snow fieldwork photos available for publication, with most recent photos displayed at the top. Please send requests for additional photos or for captions to jderry@snowstudies.org. All Photos © Center for Snow and Avalanche Studies.

Click each photo for a larger version and for captions. Mouse over the large images to display captions, including the date of the photo.