Lands transitional between terrestrial and aquatic systems where the water table is usually at or near the surface or the land is covered by shallow water.


A low wall or dam built across a stream or river to raise the level of the water or to change the direction of its flow.

Tieback Embankment

The embankment constructed between the diversion inlet control structure, the Wild Rice River control structure, the Red River control structure and high ground in Minnesota.

Staging Area

A defined area immediately upstream of the dam. When the Project is operated, water would be temporarily detained in the staging area to minimize impacts downstream. The staging area encompasses…


A geographic area from which water is drained by a river and its tributaries to a common outlet. A ridge or drainage divide separates a watershed from adjacent watersheds.

Spoil Piles

excavated materials consisting of topsoil or subsoils that have been removed and temporarily stored during the construction activity. (https://www.michigan.gov/documents/deq/deq- wb-nps-sp_250905_7.pdf)


A passage for surplus water to run over or around an obstruction (as a dam) created with rocks.

Special Flood Hazard Area (SFHA)

An area having special flood, mudflow or flood-related erosion hazards and shown on a Flood Hazard Boundary Map (FHBM) or a Flood Insurance Rate Map (FIRM) Zone A, AO, A1-A30,…

Significant Effect

An effect that is predicted to be above an identified threshold and/or an effect that was determined by the lead agencies to have a magnitude that is great based on…

Riparian Floodplain

A bottomland, deciduous or deciduous-conifer forest community occupying low- lying areas adjacent to streams and rivers of third order or greater, and subject to periodic over-the- bank flooding and cycles…

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