Each ArcMap shapefile contains multiple climate scenarios. Consult the metadata for descriptions of these scenarios to choose those most of interest.
If you have any questions about the downloads on this page, please contact the web manager.
Scenario Maps
NorWeST stream temperature scenario maps were developed at a 1-kilometer resolution using spatial statistical stream network models. Stream temperature data used to fit the temperature model that created the scenario maps were screened using a consistent set of criteria to ensure the use of accurate temperature measurements.
Application of these techniques in previous research has yielded accurate and unbiased stream temperature models and predictions (R2 ~ 0.90; RMSE < 1.0 ˚C; for more details, click here). Multiple historical scenarios from 1993 to 2015 are available, as are future scenarios for mid-century (2030–2059), end-of-century (2070–2099), and date agnostic temperature increases (e.g., +1C relative to historical baseline periods). The stream temperature scenarios can be downloaded as geospatial data, which enables the display and querying of stream temperatures for river basins and other areas of interest across the western U.S.
Citation to use with these scenarios: Isaak, D.J.; Wenger, S.J.; Peterson, E.E.; Ver Hoef, J.M.; Hostetler, S.W.; Luce, C.H.; Dunham, J.B.; Kershner, J.L.; Roper, B.B.; Nagel, D.E.; Chandler, G.L.; Wollrab, S.P.; Parkes, S.L.; Horan, D.L. 2016. NorWeST modeled summer stream temperature scenarios for the western U.S. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2016-0033.
HUC 3s within Processing Units
Model Results
Data are added as basins are completed and are subject to periodic revision.
For more information about data revision, click here.
The scenarios were developed at a 1-kilometer resolution as described in: Isaak, Daniel J.; Luce, Charles H.; Horan, Dona L.; Chandler, Gwynne L.; Wollrab, Sherry P.; Dubois, William B.; Nagel, David E. 2020. Thermal regimes of perennial rivers and streams in the western United States. Journal of the American Water Resources Association. doi: 10. 1111/1752-1688.12864.
