Harmon Lake - Mandan, North Dakota
136 Acre Freshwater Recreation Lake
3 Deep-Flo Mixers
1 - Floating Sensor Platform with Algae Probe
INSTALLATION JULY 2025
Harmon Lake is a recreational lake with fishing, swimming and kayak rentals as well as a nearby campground. The lake is fed by a large watershed of primarily pastureland, however the nutrient load from runoff over native prairie is likely minimal. The lake experiences periodic algae blooms with some toxic blue/green (cyanobacteria) algae. The nutrients that feed the algae growth is likely from decaying plants and tree residue located at the bottom of the lake. Dissolved oxygen profiles are limited or non-existent, but the reactions appear to suggest there is an oxygen deficiency in the lower 2/3rds of the reservoir.
Deep-Flo Solution!
Maintain water quality standards established by the North Dakota Department of Environmental Quality to stay out and remain out of Harmful Algal Blooms (HABS) Advisory Status.
Expand the mixed depth of the epilimnion while increasing dissolved oxygen absorption and thereby increase clarity and reduce/control algae populations.
Reduce or eliminate thermal stratification in the metalimnion by drawing colder and denser water to the surface and creating a more gradual temperature profile.
Increase dissolved oxygen in the hypolimnion and gradually turnover or exchange the stagnant water from the deepest part of the lake.