HomeMy WebLinkAbout2026 Otto Lake POI Survey Report2026 Otto Lake (DOW: 27067800, Hennepin County)
Aquatic Vegetation Point Intercept Survey Report
4/21/2026
An aquatic vegetation point intercept survey was completed in Otto Lake on 4/19/2026 for the City
of Edina. The point intercept survey consisted of 67 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.
The table below shows all the species sampled during the 2026 Otto Pond vegetation survey.
Curlyleaf pondweed was sampled in 2026 at 10% of the sites. It was not sampled in 2025. Northern
watermilfoil was the most abundant species sampled, being collected at 37% of the sites. Like
2025, Identiflcation to northern watermilfoil was performed by leafiet count, however there was a
hybrid quality to plants sampled.
Species Frequency of Occurrence (%) Average Rake Abundance
Curlyleaf pondweed 10 1.2
Northern watermilfoil 37 1.4
Coontail 16 1.9
Common waterweed 25 2.2
Flatstem pondweed 4 1
Sago pondweed 1 1
Chinese mystery snail was observed at multiple sites.
Figure 1: Otto Lake (waterbody east of the path) curlyleaf pondweed distribution and abundance
Figure 2: 2026 Otto Lake northern watermilfoil distribution and abundance
Figure 3: 2026 Otto Lake common waterweed distribution and abundance
Figure 4: 2026 Otto Lake coontail distribution and abundance
Figure 5: 2026 Otto Lake flatstem pondweed distribution and abundance
Figure 6: 2026 Otto Lake sago pondweed distribution and abundance