Northern Prairie Wildlife Research Center
| Figure 4. -- A Typical bog (Type 8) in New Hampshire with a stream furnishing the only dependable surface water. |
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| Figure 4a. -- A dam has impounded shallow water over most of the former bog and made it into a good waterfowl pond (Type 5). |
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| 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. |
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| 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. |
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| 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. |
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U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/wetlands/uswetlan/fig4.htm
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