HomeMy WebLinkAbout2026 June Lake Edina POI Survey Report2026 Lake Edina (DOW: 27002900, Hennepin County)
Aquatic Vegetation Point Intercept Survey Report
6/28/2026
An aquatic vegetation point intercept survey was completed in Lake Edina on 6/14/2026 for the City
of Edina. The point intercept survey consisted of 100 points. The purpose of the survey was to
inventory aquatic vegetation species during the summer growing season in June. A second survey
will be completed in August. 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.
13 species of vegetation were sampled during the survey in 2026 with the most abundance species
being Elodea canadensis (75%), followed by sago pondweed (68%). Curlyleaf pondweed was
sampled at 3% of the sites, however, it was sampled at low abundance. Perhaps this could be used
for next year’s curlyleaf pondweed treatment. See table 1 for full species list.
Table 1. 2026 June Lake Edina aquatic vegetation species list, frequency of occurrence, and average rake abundance
Species # of
Sites
Frequency of Occurrence
(%)
Average Rake
Abundance Figure #
Chara 33 33 1.8 10
Coontail 13 13 1.5 6
Curlyleaf Pondweed 3 3 1.0 3
Elodea canadensis 75 75 2.2 4
Horned Pondweed 16 16 1.1 9
Large Duckweed 1 1 1.0 Not mapped
Leafy Pondweed 43 43 1.2 7
Nitella 1 1 1.0 11
Northern Watermilfoil 57 57 1.4 8
Sago Pondweed 68 68 1.7 5
Slender Naiad 2 2 1.5 12
Small Duckweed 3 3 1.0 Not mapped
White Waterlily 1 1 2.0 13
Survey metrics were used to calculate Index of Biological Integrity scores for vegetation richness
and floristic quality index. Lake Edina met the shallow lake state standard for richness; however, it
did not meet the state standard for floristic quality index (Table 2).
Table 2. June 2026 survey IBI metric results compared to the state standard
Metric 2026 Edina Score Shallow Lake Standard
Richness 13 11
Floristic Quality Index 17.20 17.8
Below is a series of maps of Lake Edina site richness (Figure 1), overall site abundance (Figure 2),
and individual plant species distribution and abundance. Submerged and large floating species are
mapped. Small floating and emergent species were not mapped.
Figure 1. June 2026 Lake Edina Site Richness. Minimum richness was 0 (1 sites) and maximum richness was 7.
Figure 2. June 2026 Lake Edina Overall Site Abundance. 84% of sites had a rating of 3, 7% of sites had an abundance of 2,
and 6% of sites had an abundance of 1.
Figure 3: June 2026 Lake Edina curlyleaf pondweed distribution and abundance
Figure 4: June 2026 Lake Edina Elodea canadensis distribution and abundance
Figure 5: June 2026 Lake Edina sago pondweed distribution and abundance
Figure 6: June 2026 Lake Edina coontail distribution and abundance
Figure 7: June 2026 Lake Edina leafy pondweed distribution and abundance
Figure 8: June 2026 Lake Edina northern watermilfoil distribution and abundance
Figure 9: June 2026 Lake Edina horned pondweed distribution and abundance
Figure 10: June 2026 Lake Edina Chara distribution and abundance
Figure 11: June 2026 Lake Edina Nitella distribution and abundance
Figure 12: June 2026 Lake Edina slender naiad distribution and abundance
Figure 13: June 2026 Lake Edina white waterlily distribution and abundance