Efforts to coalesce existing data and integrate associated computer modeling products are increasingly necessary for effective management of land, water, energy, agricultural, and wildlife resources. Streamflow measurements are made by various agencies for different purposes, but these data are often not easily discoverable, which limits access to the potentially-available data in a given region. A geospatial dataset that shows where, when, and how streamflow has been measured, and the original purpose of the data across research, management, and restoration activities, will help resource managers collaboratively fill streamflow data gaps and curate a prioritized list of streamflow datasets of importance to stakeholders. Currently, Kaiser et al. (2023) and Montana’s Stream and Gage Explorer (StAGE) are the only known projects that have a regional-scale catalog of stream gages overseen by various operators.

AZStreamCAT is a project that is creating a map of virtually all streamgage and streamflow measurement locations in the state of Arizona, and is linking them to a catalog of metadata. This is the first project of its kind in the state, and it will be useful to a variety of stakeholders, from anglers and kayakers who seek to know the flow in a river prior to enjoying fishing and water recreation, to environmental consultants who seek flow data for environmental assessments, to agencies such as FEMA, the Federal Emergency Management Agency, who seek to know streamflow in remote areas that might be subject to flooding. Once Arizona’s catalog has been developed, we can feasibly expand to include all seven states in the Colorado River Basin and/or develop a catalog of precipitation gages as well.