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Northern Prairie Wildlife Research Center

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Wetlands of the United States

Their Extent and Their Value To Waterfowl and Other Wildlife

Figures 4 - 7

Figure 4. -- A Typical bog (Type 8) in New Hampshire with a stream furnishing the only dependable surface water.
A New Hampshire bog

Figure 4a. -- A dam has impounded shallow water over most of the former bog and made it into a good waterfowl pond (Type 5).
Dam that forms a waterfowl pond

Figure 5. -- Horicon Marsh in Dodge County, Wis., where level ditches at 100-foot spacings have increased muskrat production to about 18 per acre of marsh. Waterfowl use has also increased. Banks created by ditching make good waterfowl nesting sites.
Horicon marsh

Figure 6. -- Pothole blasted by Wisconsin Conservation Department in Rat River Marsh, Winnebago County, Wis. Man-made water areas like this improve water-deficient marshes for both waterfowl and muskrats.
Man-made pothole

Figure 7. -- Highway pond above Portsmouth, N.H., where new turnpike was used as a dam to impound a former salt marsh. Outlet structure, which includes a fishway, is shown at extreme lower right. The development resulted in substantial benefits to fish and wildlife.
Highway pond

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