Population
Environmental Indicators:
Societal Indicators:
Disclaimer: This tool is best viewed in Chrome, Firefox, Microsoft Edge, and Safari browsers. It does not work with Internet Explorer.
The initial map shows the percent change in population by county from 1970 to 2022.
Each of the above highlighted attributes can be changed in the grey sidebar to the left of the map. Click the Update Map button to refresh the map based on your selections.
Click a location on the map and scroll down to see how population changes over time at that location. Click on the tabs to view additional information. Click on the magnifying glass icon on the right side of the map to search for a location.
Population relative to start year (left) shows how population has changed over time for the selected location. The dashed line is the population at the selected start year.
Percent population change (right) shows the percent change in population relative to the selected start year (0%).
Population change relative to surrounding areas shows percent population change from the selected start year by relevant political boundaries (state, Corps District, and Corps Division).
Population change relative to other counties shows the 25th-75th percentile (box) and 10-90th percentile (whiskers) of population change by counties inside different political boundaries within the selected time period. If a county was selected, a horizontal black line with the county value will be displayed.
How has population growth changed? displays the population change per year. This shows how consistent population change has been over time and helps to compensate for when a time period starts or ends in extremity. Highlighted cells are for the selected start year (row).
Slope (Population / yr):
| County | Slope ≥ 10,000 | 10,000 > Slope ≤ 5,000 | 5,000 > Slope ≤ 100 | 100 > Slope > -100 | -100 ≤ Slope > -5,000 | -5,000 ≤ Slope > -10,000 | Slope ≤ -10,000 |
| State or District | Slope ≥ 100,000 | 100,000 > Slope ≤ 50,000 | 50,000 > Slope ≤ 10,000 | 10,000 > Slope > -10,000 | -10,000 ≤ Slope > -50,000 | -50,000 ≤ Slope > -100,000 | Slope ≤ -100,000 |
| Division | Slope ≥ 400,000 | 400,000 > Slope ≤ 300,000 | 300,000 > Slope ≤ 150,000 | 150,000 > Slope > -150,000 | -150,000 ≤ Slope > -300,000 | -300,000 ≤ Slope > -400,000 | Slope ≤ -400,000 |
The overall population has increased in the United States, however, population growth has varied geographically as people migrate to different geographic regions (such as from the Rust Belt to the Sun Belt) and from rural communities to urban centers. Two hundred and three Corps reservoirs (38%) are authorized to provide storage space for water to be used for irrigation and/or water supply. Changes in population growth, and subsequent water demand, have affected how reservoirs meet their authorized purposes. Some reservoirs never saw water demand (for supply or hydropower) materialize. Other reservoirs, such as Buford Dam and Lake Lanier in Georgia, have experienced large increases in population growth and subsequent water demand. Understanding regional population trends can help managers understand potential changes in water demand.