AlosApp logo; black fish outline with AlosApp text above
Center for Coastal Resources Management logo

Hello, and welcome to AlosApp!

This app was created to assist with planning for in-stream activities that may be impacted by time-of-year (TOY) restrictions. The data, analyses, and output from this application are exclusively for informational purposes and do not carry or replace any existing regulatory requirements.

Capabilities and Limitations

What can this app do? It can:

  • Predict the run status of Alewife, American Shad, Blueback Herring, and Hickory Shad in the:
    • James River
    • York River
    • Rappahanock River
  • Provide near real-time data on:
    • Sea Surface Temperatures
    • In-water Temperatures
    • Stream Discharge Volumes
  • Provide planning information for future conditions

What are the limitations of this app? It can’t:

  • Provide any regulatory guidance
  • Serve as a substitute for advice from State biologists and managers
  • Supercede any of the original data sources from which the displayed products are derived
  • Provide exact predictions of run status or catch
Please allow time for map to load

Select ALL of the files associated with the given shapefile.

The map above provides several sources of data that are roughly divided into two categories: static and dynamic. The static data sources are the anadromous fish use confirmed habitat layers from Virginia DWR ( Anadromous Fish Use Areas ). The dynamic data sources include the daily Sea Surface Temperature ( JPL MUR MEaSUREs Project, 2015 ), USGS stream discharge data ( National Water Dashboard ), and current water temperature data from in-water buoys/sensors with associated predicted run status for each species.

USGS Flow Data

From the dropdown menu below, select the station of interest to plot the historic (2001 - 2020) median daily flow vs the year-to-date flow data. To search for a site, click inside the drop-down menu, press 'Backspace/Delete' and start typing the station or stream name. Note the log-scale of the y-axis.

Year-to-Date Flow vs. Historical Flow

This tool is currently under development. Check back soon!

Future Water Temperatures

These are the simulated future water temperatures at the fall line for each river. The modeled time period is 2050-2059. The original data are sourced from Hinson et al. (2021) and are available from ( https://doi.org/10.1111/1752-1688.12916 ).

This tool is currently under development. Check back soon!

Enter the values:

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Generate Report

Report takes ~15-30 seconds to generate.