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Wetlands of the United States

Their Extent and Their Value To Waterfowl and Other Wildlife

Contributions to Other Wildlife

Table 5

Table 5. --Description and acreage of wetland types in the United States
Wetland category and type
Water depth 1
Total acres
  1. Seasonally flooded
      basins or flats
Few inches in upland; few feet along rivers23,092,000
  2. Inland fresh meadows Few inches after heavy rains 7,518,000
  3. Inland shallow fresh
Up to 6 inches 3,969,000
  4. Inland deep fresh
Up to 3 feet2,346,000
  5. Inland open fresh waterUp to 10 feet; marshy border may be present2,596,000
  6. Shrub swamps Up to 6 inches3,813,000
  7. Wooded swampsUp to 1 foot16,809,000
  8. BogsShallow ponds may be present 3,347,000
  9. Inland saline flatsFew inches after heavy rain1,064,000
10. Inland saline marshesUp to 2 feet272,000
11. Inland open saline water Up to 10 feet; marshy border 282,000
12. Coastal shallow fresh
Up to 6 inches at high tide2,213,000
13. Coastal deep fresh
Up to 3 feet at high tide1,631,000
14. Coastal open fresh
Up to 10 feet; marshy border often present197,000
15. Coastal salt flats May have few inches at high tide 423,000
16. Coastal salt meadowsMay have few inches at high tide956,000
17. Irregularly flooded salt
Few inches at wind tide698,000
18. Regularly flooded salt
Up to 1 foot at high tide1,576,000
19. Sounds and baysUp to 10 feet at high tide1,114,000
20. Mangrove swampsUp to 2 feet 523,000
1Refers to average conditions during growing season except for Type 1. In Type 1 bottomlands, flooding ordinarily occurs in late fall, winter, or spring. In Type 1 upland areas, depressions may be filled with water during heavy rain or melting snow, predominantly in early spring.

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