Water temperature, air temperature, sensor depth, and select flow and temperature metrics. Data from water year 2020 for the Stormwater Action Monitoring Puget Small Streams Project (ver. 1.1, March 2026)

These data were collected as part of the Stormwater Action Monitoring (SAM) program's Puget Small Streams (PSS) status and trends program. The data presented here were collected from 29 sites during water year 2020 for water temperature, air temperature, and sensor depth. Sensor depth was used as a surrogate for water depth and represents the arbitrary depth of water above the sensor location in the water column. Data was collected at 15-minute intervals from October 2019 until September 2020 using Hobo U20L-04 sensors that simultaneously measured temperature and pressure. All data were analyzed and approved following USGS continuous data processing procedures.

Sensor depth data was used as a surrogate for stream stage in order to calculate three flow metrics: (1) the fraction of time that flow exceeded the annual mean (TQmean), (2) the Richards-Baker Index of flashiness (RBI), and (3) the annual tally of wet-season day-to-day flow reversals following methods outlined in Booth and Konrad (2017). In addition to these flow metrics, continuous temperature data was used to calculate the 7-day average daily maximum (7DADmax) temperature at each monitoring site. Included in this data release are the final approved continuous data, the input and output files used to calculate the metrics in R, and two html files showing the R code and process used to make these calculations.

Booth, D. and C.P. Konrad. 2017. Hydrologic metrics for status-and trend monitoring in urban and urbanizing watersheds. Hydrological processes 31: 4507-4519. https://doi.org/10.1002/hyp.11369

Note: Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Refer to "version_notes.txt" for specific updates to version 1.1 of this data release.

REVISION HISTORY: First release (ver 1.0): 2025-09-03, Revision 1.1: 2026-03-12