Bear Lake Hydrologic Reconnection and Wetland Restoration

Site map

Bear Lake is a moderately to highly eutrophic lake that has high levels of total phosphorus (TP) and summer blooms of cyanobacteria (blue-green algae). Phosphorus source control is essential for the restoration of Bear Lake and removal of the Eutrophication and Undesirable Algae Beneficial Use Impairment (BUI) for the Muskegon Lake Area of Concern (AOC). Given the importance of Bear Creek as a major external source of TP loads to Bear Lake, controlling phosphorus from this tributary will provide a significant benefit for Bear Lake.

Abandoned muck farms used for celery production, but now converted into shallow ponds, are adjacent to Bear Creek just before it enters Bear Lake (see red outlined area in map on right). Given their location and past land use, these muck fields likely contain very high levels of phosphorus. Indeed, a recent study found that similarly converted celery fields located upstream of Mona Lake, another drowned river mouth system in Muskegon County, contributed a significant load of TP to Mona Lake via levee breaches.

Abandoned celery field

Restoration plans within the Muskegon Lake AOC include the hydrologic reconnection of these flooded fields with Bear Creek and improved wetland habitat. We are assisting with the restoration effort through 2 projects:

  • Our first study characterized the sediment phosphorus characteristics of the muck fields and determined the degree to which the muck fields are contributing phosphorus to the water column. Thus, potential negative impacts to downstream habitats (i.e., Bear Lake) upon reconnection were evaluated and possible mitigation strategies identified. Read the final report.
     
  • The current study involves pre-restoration monitoring of phosphorus concentrations, chlorophyll a, and general water quality  in the Bear Lake muck fields and Bear Creek. The monitoring results will be used to assist with documentation for the future removal of the Eutrophication BUI.
  • Research conducted by a former graduate student, James Smit, investigated the effects of reconnecting the two muck fields to Bear Creek. He found that reconnection could cause significant phosphorus release from the muck fields' sediments, which could negatively impact water quality in Bear Lake. Thus, any restoration plan for this area should address the high phosphorus concentrations in the muck field sediment prior to hydrologic reconnection.

Maggie Weinert

Maggie Weinert collecting a sediment core for phosphorus characterization.

Al Steinman

Al Steinman retrieving pore water samplers (i.e., peepers) after a 2-week incubation.

Mary Ogdahl

Mary Ogdahl measuring water quality with a YSI sonde.


Reports & Publications

Smit, James T. 2014.  Wetland Sediment Nutrient Flux in Response to Proposed Hydrologic Reconnection and Climate Warming. Masters Theses. Paper 733. http://scholarworks.gvsu.edu/theses/733

Steinman, A.D., and M.E. Ogdahl. 2013. Muskegon Lake AOC Habitat Restoration Design: Bear Lake Hydrologic Reconnection/Wetland Restoration. Final Project Report. National Oceanic and Atmospheric Administration.


Funding for the first study (sediment characterization) was provided by the National Oceanic and Atmospheric Administration (NOAA).
Funding for the second study (pre-restoration monitoring) was provided by the Great Lakes Commission.

Project partner:
West Michigan Shoreline Regional Development Commission (WMSRDC)

Project contacts:
Dr. Alan Steinman, Project Manager: steinmaa@gvsu.edu
Mary Ogdahl, Lead Technician: ogdahlm@gvsu.edu