Johnston Draw is a 1.8-km2 watershed in southwestern Idaho, USA (outlet location: 43.1226, -116.776) located within the Reynolds Creek Critical Zone Observatory in western Idaho, a research center with cattle grazing. Elevation ranges from approximately 1490m to 1850m. The mean annual precipitation in the watershed is 550 mm/yr with rainfall occurring at the lower elevations and snowfall, resulting in large drifts, at the higher elevations (Godsey et al., 2018). Mean annual temperatures range from 8.9C at the bottom of watershed and 4.7C near the top.

Citations:

Bilbrey, E.M. 2024. Quantifying Dissolved Organic Carbon Patterns and the Impact of Stream Network Connectivity on Export From Semi-Arid Intermittent Watersheds. Idaho State University. https://www.proquest.com/docview/3079012638/abstract/4FAB29E7230542A8PQ/1.
Godsey, S.E., Marks, D., Kormos, P.R., Seyfried, M.S., Enslin, C.L., Winstral, A.H., McNamara, J.P., Link, T.E. 2018. Eleven years of mountain weather, snow, soil moisture and streamflow data from the rain–snow transition zone—The Johnston draw catchment, Reynolds Creek Experimental Watershed and Critical Zone Observatory, USA. Earth Systems Science Data Vol. 10: 1207-1216.

Further information for all data fields can be found in the "Data Types" tab of this file. In short, this resource contains data for sites across a suite of sensor types, denoted by the sublocation field. These sublocations include:
- "SW" -- a site where regular surface water sampling occured, and contained a stilling well to record stream water level

This resource was created using geospatial analyses using publicly available topographic data (Digital Elevation Models, DEMs from the USGS National Map Downloader v2.0; https://apps.nationalmap.gov/downloader/)
Site locations GPS coordinates were collected using a eMLID Reach RX multi-band RTK rover.
Elevation was extracted from a DEM. All additional environmental data were derived from this DEM using whitebox functions for topographic and stream network analysis (Wu & Brown, 2022) in R version 4.4.0 (R Core Team, 2024).

Approach 1 site is JSS01
Approach 2 sites indicated by JPZ (Pressure Transducers)
Additional sites (STICS) indicated by JDR