The recent grip of a multi-year drought in California and the western part of the United States has highlighted just how previous water is as a resource.
Which states have the highest percentage by area of perennial water and which states have the lowest amount of perennial water?
The USGS has consolidated a table with the area of each state that covered by water from data provided by the U.S. Census Bureau’s table: Geography: State Area Measurements, 2010.
The statistics from both tables calculates the amount of area for each state and the District of Columbia that is covered by perennial water. These calculations don’t include water from intermittent, glacier, and and marsh/swamp sources.
What Percentage of the United States is Covered in Water?
Overall, the United States has 264,837 square miles of water, accounting for 7% of the total area of the country.
State with the Largest Total Area of Water
The state with the largest total area of water is Alaska, which has 94,743 square miles of water. Alaska contains approximately 12,000 rivers, 3 million lakes larger than 5 acres, and numerous creeks and ponds, accounting for more than 14% of the state’s total area.
The state with the second largest total area is Michigan, a distant second with 40,175 square miles.
States With the Highest Percentage of Water
Percentage wise, however, Michigan ranks as the number one state with 41.5% of its total area occupied by water. Michigan has more than 64,980 inland lakes and ponds.
Michigan is flanked by four of the five Great Lakes, as well as Lake St. Clair, and boasts the world’s longest freshwater shoreline of any governmental unit.
Sources of water are so abundant in Michigan that no one is ever more than 6 miles from a body of water in Michigan, or 85 miles from a Great Lake.
Hawaii, with 41.2% of its total area water-based, is a close second. Hawaii is the only state that is totally surrounded by water and is made up of islands.
Hawaii has an abundance of fresh water and hundreds of streams but very few natural lakes. Only In Hawaii, there are just five natural lakes, all of which are quite small, but 266 freshwater reservoirs with a surface area of up to 400 acres have been formed by impounding stream waters.
Alaska’s percentage of area that is water is only 14.2%.
What are the Driest States?
The driest states are found mostly in the mid-west and western part of the country. New Mexico, Arizona, Colorado, Kansas, Nevada, Wyoming, Nebraska, Iowa, and West Virginia all have less than 1% of each state’s total area as water.
Tile-grid Map Showing Percentage Water Area Per State
The tile-grid map (see how to make a Tile Grid Map using Excel) below shows which states are the driest (light grey and light blue) and which states are the wettest (medium and dark blues).
Only three states have 30% or more water area: Rhode Island, Michigan, and Hawaii. On the dry side, thirty states have less than five percent water area.
This chart shows how the states stack up in terms of percentage area that is water:
Table: Land Area and Water Area of Each State and the District of Columbia
This table shows the total land area and water area of each state and the District of Columbia.
|Percent area, water|
|District of Columbia||68||177||61||158||7||19||10.30%|