Marshes are a type of wetland. Tidal marshes are located adjacent to oceans. The non-tidal or inland marshes are those that are found in fresh water areas. Freshwater marshes are characterized by periodic or permanent shallow water, little or no peat deposition, and mineral soils. They typically derive most of their water from surface waters, including flood water and runoff, but do receive ground water inputs.
Major regions of the United States that support inland marshes include the Great Lakes coastal marshes, the prairie pothole region, and the Florida Everglades. After the last glacier that covered Michigan receded ten to twelve thousand years ago, the Great Lakes area wetlands formed. Marshes, typified by an absence of trees and shrubs, developed in low-lying areas which had a high water table.
St. John’s Marsh is a fresh water marsh that is located in St. Clair County, Michigan. It is maintained by the Michigan Department of Natural Resources and is open year round. It is possible to explore this 2,744 acre marsh by canoe or kayak. Be aware that St. John’s Marsh Wildlife Area is part of the Great Lakes Coastal Marsh ecosystem and water levels fluctuate within the Great Lakes. During low water periods the marsh may become pools of very shallow water and mudflats. These periodic fluctuations create water and vegetation conditions that are healthy for the ecosystem, but may be a temporary inconvenience for recreational users.
The posted coordinates will take you to a monument identifying the St John’s Marsh as a protected wetland area. The plaque is missing. You will then drive east to a parking area. There is a marked pathway that leads out into a forty acre parcel of the marsh. There are several signs that describe the flora and fauna of the marsh. There are signs that explain the nature of the marsh. There are three requirements for logging this earth cache.
1) At N42 37.706 W082 36.219 read the plaque and email me the number of acres that were purchased in 1977. Plaque is missing.
2) At N42 37.810 W082 36.193 perform a ph test of the marsh water. Email me the results of the test.
3) Post a picture of yourself taken at N42 37.894 W082 36.167 near the sign that is titled “Marsh Wildlife” with your back to the marsh (north).