Shore Lore: Common Problems
Erosion: Water Level Fluctuation or "Bounce"
Water levels naturally change over the course of the season, but wide water level fluctuations or "bounce" can be dramatic on some lakes. Fluctuations in water levels can cause damage to unstable shorelines and shorelines without native vegetation. When planting near the water's edge, it is important to select native species that can tolerate "bounce" if you have significant water level fluctuations.
Bear Paw Resort near Park Rapids, Minnesota encompasses 650 feet of shoreline on Two Inlets Lake ("before" photo at top). In the spring of 2000, native grasses, wildflowers, shrubs, and aquatic plants were planted along 315 feet of their shoreline.
Two weeks after planting, several storms caused water levels to rapidly rise about 2 feet, and it took 3 to 4 weeks for water levels to return to their normal summer level. Many of the plants did not have enough time to get their roots down into the soil before the water levels rose, and either washed away or died (bottom photo). The high water levels also caused substantial erosion to the shoreline, requiring biologs to be installed in the fall before additional plants were added.
List of species tolerant of fluctuating water levels:
See the "Starter Lists" in the Native Plant Encyclopedia.