Arizona

Florida

Montana

North Dakota

Saskatchewan

Texas

British Columbia

Newfoundland and Labrador

Québec

Manitoba

Ontario

South Dakota

None

A map displaying locations of major dams marked by blue dots. High concentrations are seen in the USA, Europe, and East Asia. Other notable locations include Brazil, South Africa, and Australia. Some regions, like central Africa, have fewer dams.

Dams with a reported storage capacity of 5,000 million cubic meters (5,000,000,000 cubic meters) or more

Major Dams

World

GlobalDamWatch.org

Alaska

Utah

Yukon

Northwest Territories

District of Columbia

Idaho

New Hampshire

Rhode Island

Vermont

Washington

Wyoming

Nunavut

Maine

Kentucky

Nova Scotia

Virginia

Delaware

Prince Edward Island

Mississippi

West Virginia

Nebraska

Missouri

Louisiana

Hawaii

North Carolina

Oregon

New Brunswick

Alabama

New Mexico

Kansas

Wisconsin

New Jersey

South Carolina

Michigan

Alberta

Connecticut

Pennsylvania

Colorado

Nevada

Massachusetts

Georgia

New York

Maryland

Oklahoma

Tennessee

California

Arkansas

Ohio

Indiana

Minnesota

Iowa

Illinois

A global map shows lightning flashes per square kilometer per year (flashes per square kilometer per year).

Lightning flashes per square kilometer per year (flashes/km²/year)

Lightning Frequency

The map illustrates global lightning frequency. Areas with less than 0.1 flashes per square kilometer per year are shaded in light green and include most ocean regions, northern Canada, the Sahara Desert, and parts of western and northern Europe. Areas with 0.1 flashes per square kilometer per year are shaded in light yellow and are scattered along parts of oceanic regions and coastal regions. Regions with 0.2 flashes per square kilometer per year are shaded in light purple and include parts of oceanic regions, coastal regions in the north of Canada and Russia. Areas with 0.4 flashes per square kilometer per year are shaded in red and are scattered along the Atlantic ocean, coastal regions on the north of Russia, Indian Ocean, and Pacific ocean. Areas with 0.6 flashes per square kilometer per year to 1 flash per square kilometer per year are shaded in blue to light green, covering northern Canada, the contiguous United States (excluding the Southeast), parts of South America, much of northern region of Europe, most of Africa south of the Sahara, and most of South, East, and Southeast Asia, including south of Australia. Areas experiencing 2 to 10 flashes per square kilometer per year, indicated by pink to blue shades, include the Southeastern United States, parts of Central and South America, and large areas in Africa, South, East, and Southeast Asia. High lightning frequency regions (20 to 50 flashes per square kilometer per year) are highlighted in dark pink to dark red, located in Southeastern United States, Colombia in South America, Central Africa (notably the Democratic Republic of Congo), and Southeast Asia, particularly in Indonesia, Vietnam, and Cambodia.

Display by:	Major Dams	Lightning Frequency
	Major Dams	Lightning Frequency	<0.1 flashes/km²/year	0.1 flashes/km²/year	0.2 flashes/km²/year	0.4 flashes/km²/year	0.6 flashes/km²/year	0.8 flashes/km²/year	1 flash/km²/year	2 flashes/km²/year	4 flashes/km²/year	6 flashes/km²/year	8 flashes/km²/year	10 flashes/km²/year	20 flashes/km²/year	30 flashes/km²/year
Alaska		6.63%	1.78%	25.5%	0.226%	5.17%
Arizona	1									1.13%	23.6%	20.0%	37.0%	18.2%
Utah										22.2%	65.3%	0.130%
Yukon			2.57%	1.17%	39.3%	42.1%	0.676%	0.532%	2.01%
Northwest Territories		10.4%	11.3%	1.93%	1.61%	13.9%	14.4%	4.36%	8.69%
District of Columbia														100%
Florida	1													0.168%	52.7%	47.1%
Idaho									8.51%	90.0%
New Hampshire										77.0%	23.0%
Rhode Island										100%
Vermont										4.97%	95.0%
Washington				1.04%	10.6%	19.8%	20.2%	12.1%	35.6%	0.648%
Wyoming										48.7%	16.7%	16.6%	10.4%	7.61%
Nunavut		41.3%	36.7%	7.71%	1.80%	1.53%	0.139%
Montana	1								1.84%	16.7%	6.56%	12.0%	2.35%
Maine									5.45%	71.9%
North Dakota	1									5.40%	24.2%	48.6%	17.6%
Kentucky														100%
Nova Scotia					8.11%	10.6%	36.1%	17.3%	27.8%
Virginia												0.585%	33.4%	66.0%
Delaware										1.09%	21.6%	74.1%	3.24%
Prince Edward Island						2.52%	8.96%	20.3%	68.2%
Saskatchewan	1						0.267%	0.717%	31.5%	16.7%	3.54%
Mississippi														53.6%	46.4%
West Virginia													90.8%	9.25%
Nebraska													2.93%	89.3%	7.74%
Texas	1											1.17%	8.70%	65.9%	24.2%
Missouri														97.2%	2.76%
Louisiana															100%
Hawaii			0.113%	0.444%	32.9%	60.0%
North Carolina														100%
Oregon				0.565%	3.81%	5.52%	5.86%	3.52%	49.6%	23.8%
New Brunswick								0.276%	0.234%	58.0%
Alabama														41.8%	58.2%
New Mexico												7.94%	33.3%	53.7%
Kansas														96.1%	3.88%
Wisconsin										0.368%	53.9%	28.7%	12.9%	3.74%
British Columbia	1		1.64%	6.95%	12.6%	20.1%	4.57%	5.28%	0.164%	6.19%
Newfoundland and Labrador	1		5.05%	7.84%	8.94%	30.5%	12.3%	3.57%	0.308%
New Jersey											9.73%	90.3%
South Carolina														85.1%	14.9%
Michigan										1.83%	31.7%	16.4%	14.6%	8.66%
Alberta									22.8%	73.1%	3.13%
Connecticut										77.5%	20.8%	1.09%
Pennsylvania											7.74%	34.9%	57.3%
Colorado										3.18%	32.7%	15.2%	10.5%	30.1%	8.34%
Nevada								1.83%	39.4%	47.0%	11.8%
Massachusetts									2.27%	79.0%	18.5%
Georgia														48.4%	51.6%
New York										16.1%	65.1%	18.0%	0.137%
Maryland											2.23%	17.7%	58.3%	21.7%
Québec	1		11.0%	4.90%	11.5%	3.83%	3.39%	3.67%	19.7%	17.8%	0.183%
Manitoba	1					2.65%	4.40%	2.91%	25.0%	48.7%	10.4%
Oklahoma														64.4%	35.6%
Tennessee														100%
Ontario	1						2.58%	3.28%	0.872%	19.2%	2.31%	2.14%	0.326%	0.285%
California				2.29%	10.6%	16.3%	5.69%	2.96%	35.4%	15.6%	1.52%
Arkansas														15.7%	84.3%
South Dakota	1											2.09%	52.0%	45.9%
Ohio													23.4%	76.6%
Indiana														100%
Minnesota										13.4%	3.05%	20.4%	21.8%	9.11%
Iowa											5.30%	6.65%	14.4%	73.6%
Illinois													1.50%	98.5%

MapMaster 3

Major Dams