Loading...
HomeMy WebLinkAbout2025 Indianhead Lake POI Survey Report Revised2025 Indianhead Lake (DOW: 2700400, Hennepin County) Aquatic Vegetation Point Intercept Survey Report 4/18/2025 An aquatic vegetation point intercept survey was completed in Indianhead Lake on 4/18/2025 for the City of Edina. The point intercept survey consisted of 100 points. A meandering delineation was also performed to detect any additional curlyleaf pondweed not in the proximity of a site. At each site depth was recorded and vegetation was sampled with a double-sided rake. For every species sampled, an abundance rating was assigned based on how much was sampled on the rake. The ratings are as follows: 0. Plant species absent 1. Plant species covers <25% of the rake 2. Plant species covers 25-75% of the rake 3. Plant species covers >75% of the rake This rating scale was taken out of the Minnesota Department of Natural Resources Guidance for Delineating Aquatic Plants for Management. Table 1: Plant species found in Indianhead Lake in 2025 with the number of sites where it was sampled and average rake abundance when it was sampled. 0 1 2 3 Frequency Avg. Rake Abundance Chara 0 1 3 96 100 3 Curlyleaf Pondweed 87 9 1 3 13 1.5 Small Pondweed 98 2 0 0 2 1 Curlyleaf pondweed was not highly distributed in Indianhead Lake (See figure 1), being found at 13% of sites, however, it was abundant at a few sites where it was sampled with an average rake abundance of 1.5. Spot treatment of the highly abundant areas would be recommended. Clarity was extremely high, so it was very easy to spot large stands of curlyleaf pondweed even in deep areas. Like 2024, chara spp was the most abundant plant species in Indianhead Lake (See figure 2). It was found at all 100 sites (frequency of occurrence: 100%) with an average rake abundance of 3. Small pondweed was an additional species sampled in 2025, being sampled at 2% of sites. Glands and leaf tip were used to identify small pondweed. Table 1a: 2025 Indianhead Lake CLP distribution and abundance Figure 1b: 2024 Indianhead Lake CLP distribution and abundance Figure 2a: 2025 Indianhead Lake Chara distribution and abundance Figure 2b: 2024 Indianhead Lake Chara distribution and abundance Figure 3: 2025 Indianhead small pondweed distribution and abudnace