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Example of good pond design watershed

Pond Damage and Renovations

Many ponds are well protected with good sod growth. When sod establishment is not sufficient, place football sized stones or pieces of broken concrete along the dam or the affected area several feet above and below the water level. This will effectively protect the area. You can also stack and anchor logs along the eroded area several feet out in the water to absorb the energy of waves and prevent erosion. See the Aquatic Plants in Ponds webpage for more information.

These water-loving animals will find a way into your pond. Turtles and muskrats will eat pond plants. Muskrat burrows only cause damage if there are too many along the dam.  To prevent this, don’t let a thick stand of cattails or other tall plant become established on the dam.  Allowing trapping in your pond can help to control the number of muskrats. A common misconception is that snapping turtles will eat so many fish that their numbers will drop. They primarily eat dead fish, but any live fish they catch are small and abundant.

Use proper dam construction techniques and don’t build a pond in an area with exposed limestone or permeable soils. Pond dams with a well compacted clay core tied into existing clay substrate rarely leak if burrowing animals are not allowed to penetrate the core.  Repair of a leaky dam or pond bottom is often difficult, expensive and requires draining the pond. A blanket of clay taken nearby or the addition of bentonite to the bottom can seal leaks.

Muddy water is often caused by a watershed that has unprotected soil; row crop is one use of land that can lead to a pond with muddy water.  Letting cattle drink from the pond can also make the water muddy. A larger buffer strip of grass planted around the pond can reduce soil erosion and help stop chemicals from entering the pond. It will not clear up the water from a pond with a lot of bare soil in its watershed.  If the self-sustaining bass-bluegill fishery has died or been reduced because of chemical poisoning or an extended time without oxygen in the water, the multiplying of common carp, bullhead, green sunfish, crayfish, or even burrowing mayflies can make the water muddy.

Deepening shoreline areas when building the pond can remove many future aquatic vegetation problems. This can often be done at little or no extra cost if borrow areas for dam material are taken from along the shoreline. Deepen these areas so there is a slope of 3:1 down to a depth of 6 feet. Limit these steep shorelines to two thirds of the pond. Keep the remaining third shallow for fish spawning, nursery areas and for other wildlife uses. Early spring or fall, when the lake is not stratified, are the best times of year to renovate a pond. Start fish renovations only in ponds with adequate depth (8-12 feet), sufficient size (1/2 acre or larger), controlled watersheds, and undesirable fish populations. Fish population improvements in poor ponds would be short-lived and costly. Contact your local fisheries management biologist for renovation options and a list of licensed pesticide applicators who can help renovate your pond.

Pond Design

Proper planning and construction are essential to building a pond that meets owner needs. Ponds are built for a variety of reasons, including watering livestock, fishing, recreation, wildlife or to enhance the beauty of a homestead. Each of these reasons require slightly different plans.

Many problems can be avoided if the pond is properly designed and constructed. Seek advice from the USDA Natural Resource Conservation Service (NRCS) for site selection, design and construction. Their agents can help with soil surveys, site selection, pond design, and construction. Check also with your county Soil and Water Conservation District (SWCD) and local office of the Iowa State University Extension Service. Iowa DNR fisheries biologists can also provide valuable input on site selection and watershed consideration for fishing and multiuse ponds.


Pond Watershed:

The best ponds in Iowa have 10 to 20 acres of watershed for each surface acre of water impounded. Protected timber is preferred as watershed cover. Other good watershed covers are grassland and pasture. Row crop is the worst watershed cover because silt loaded runoff shortens pond life and reduces fish populations.



Livestock Watering:

Ponds that have a small pipe (2 inch) in the lower part of the dam can be used to water livestock. The pipe should extend into the pond and connect with a standpipe, the top of which should be four feet lower than the water surface when the pond is full. A watering tank with a float valve placed below the dam will keep a steady water level in the tank. Using a watering pipe and tank to provide cool fresh water instead of letting livestock go into the pond will keep the dam and pond banks from being trampled by livestock. Contact your local NRCS office for help with designing one of these systems.




Pond Fencing:

Fence in the pond and dam to keep livestock out. Built the fence at least 60-100 feet from the pond edge. Livestock that have unlimited access to the pond can ruin the pond’s bank slopes and sod, weakening the dam and spillway. Livestock wading into the water will destroy fish spawning nests and create muddy water. A grass buffer strip inside the fence can reduce soil erosion and chemical runoff going into the pond.

Wildlife Benefits:

Most wildlife species need nesting or denning cover, a food supply, escape cover and winter cover. Lack of one or more of these needs may limit total population numbers. Buffer strips next to ponds provide critical nesting, denning, winter and escape cover for wildlife. This cover can also improve the quality of the water and increase the life of the pond by reducing soil losses from erosion.

Seeding areas next to the pond to grass or legumes can reduce erosion and provide wildlife nesting areas. Native warm season grasses such as Switchgrass, Indian grass or Big bluestem, provide excellent erosion control and wildlife habitat. Conifers can provide winter and escape cover. Other medium-sized trees such as mulberry and wild plum provide cover as well as food. Shrubs provide many benefits including food production, escape and winter cover and excellent nesting areas for wildlife. Contact your local DNR wildlife management biologist for technical help to plan for the best wildlife habitat around your pond. Your local county’s USDA office may offer help with the cost of adding wildlife habitat around your pond.

Wildlife Benefits

Example of wildlife habitat development:

(1) Nesting Cover:
Bluestem, Switchgrass, Indian grass, Birdsfoot trefoil, Sweet clover, Alfalfa

(2) Winter Cover:
Juniper, Cedar, Pines

Escape Cover:
(3) Ninebark, Dogwood, Bush junipers, Elderberry, Raspberry

(4) Seed Producing Trees:
Wild plum, Mulberry, Osage orange

(5) Mast Producing Trees:
Walnut, Oak, Choke cherry