Common Pond & Lake Concerns
The primary purpose of many ponds in Rosemount is to collect stormwater runoff (rain and snow melt) and reduce the risk of flooding. The City performs inspections of stormwater ponds on about a 5-year cycle to make sure that ponds function as designed.
In early spring, after ice-out, dead fish may be seen along the shoreline. Usually this is a common occurrence after a harsh winter when ice and snow limit the amount of sunlight reaching into the water. With little light, aquatic plants photosynthesize less, producing less oxygen. Low oxygen levels in the water cause some fish to suffocate. A similar situation can happen in summer after an algae bloom and subsequent die-off. Decomposition of the algae uses up oxygen, making less available for fish.
Photo Credit: Minnesota Pollution Control Agency
Help Protect Water Quality in Ponds & Lakes
Water quality is an important issue that impacts everyone, and we are all responsible for protecting our water resources. Here are some simple things that you can do to help.
- Reduce runoff: When rain and snowmelt run off your driveway, it washes pollution into storm drains, which lead straight to your neighborhood pond. Reduce runoff by directing your downspouts onto your yard, not your driveway. You can also install a rain barrel or build a rain garden to capture runoff.
- Learn about our Stormwater Rebate Program.
- Keep fertilizer on the lawn: It's illegal to leave fertilizer on hard surfaces such as driveways, sidewalks, and roads because the fertilizer can wash into storm drains. Also, fertilizer may not be used within 20 feet of the end of any wetland, pond, or lake.
- Rake leaves, grass clippings, branches and other yard waste OFF the street: Yard waste debris can be unsafe for traffic and may cause flooding by plugging up storm drains. Learn about composting and where to take yard waste.
- Pick up pet waste and put it in the garbage: Rain and snowmelt runoff can wash pet waste into storm drains and ponds. As it decomposes, the waste releases bacteria (E. coli, salmonella), parasites (Giardia), and nutrients (such as phosphorus) into the water.
- Wash vehicles on the lawn, not on your driveway: The soapy water won't hurt your grass, but it it ends up in a storm drain it can harm your neighborhood pond.
- Reduce or eliminate winter salt use: Instead of salt, try using sand or non-clumping kitty litter for traction on ice. Shovel snow as soon as possible to keep your walkways clear and prevent ice-buildup so that you don't need salt. If you do use salt, read package instructions so that you don't over-apply. Keep in mind that, in general, you need less than 1 pound of salt per 250 square feet (roughly the size of two average parking spaces). This amount may be less than you think - a 12-ounce coffee mug holds about a pound of salt.