Dataset DOI: 10.6078/D1941T

Description of the data and file structure

Water Years 1971 through 2019 include data on snow depth and SWE measurements that were collected using a federal sampler and/or a large snow stake at 9:00 Pacific Standard Time (PST) each day. New snowfall measurements used a snow board and ruler at 8:00 and 16:00 Pacific Standard Time on days when snowfall occurred and were then totaled for daily new snow quantity.

Beginning in Water Year 2021, SWE values were obtained from the USDA NRCS SNOTEL site at the lab at 00:00 local time and snow depth measurements were obtained from a snow depth pole permanently installed at the site measurement location at 8am PST. New snowfall measurements used a snow board and ruler at 8:00 and 16:00 Pacific Standard Time on days when snowfall occurred and were then totaled for daily new snow quantity.

Measurement Notes:

Measurements of snowfall were rounded to the nearest 0.5 cm and measurements of precipitation were rounded to the nearest mm. Snowfall amounts < 0.5 cm when measured with the snow board and ruler were labelled as “Trace” or “T” accumulations. Periods with no measurement and/or missing values are recorded as “–”. References to “patchy”, “patches”, “small patches”, or “large patches” are in reference to snow cover on the site. 

Change log:

2025-08-05

1. Expanded dataset by including .csv files for 2021-2024 water years.
2. Standardized date format between all files.
3. Previously, absent values were reported with either ‘NA’ or ‘–’. These have all been changed to ‘–’ for continuity. 
4. Remarks were checked and additional context was added to existing daily remarks for clarification.
5. A typo was corrected in Water Year 2006 where a value was “209” and was changed to “290”.