Loss of Aquatic Habitat in Quincy Bay

by J. Rodger Adams, Illinois State Water Survey, Champaign, IL, USA,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


Quincy Bay is a backwater area along the upper Mississippi River near Quincy, Illinois. The construction in 1969 of a small boat access channel about 3. 2 km upstream of the natural bay outlet changed circulation patterns in the bay and accelerated sedimentation in several parts of the bay. Three areas illustrate recent changes in habitat: 1) lower Broad Lake, which has been directly affected by the access channel, 2) Triangle Lake, which has been used as a sediment trap since 1956, and 3) the middle main bay, which has been a popular boating area. The amount of change and the rates of sedimentation since 1969 are compared with previous conditions. Each area is analyzed for sediment inputs from several sources and each source's contribution to sediment deposition.

Subject Headings: Bays | Aquatic habitats | Sediment | Channels (waterway) | Water circulation | Lakes | Sediment transport | Backwater | Illinois | United States | Mississippi River

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