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dc.contributor.authorUnited States. Army. Corps of Engineers. St. Louis District.-
dc.descriptionDefinite Project Report with Integrated Environmental Assessment-
dc.description.abstractThe Calhoun Point Habitat Rehabilitation and Enhancement Project is located in Calhoun County, Illinois, at the confluence of the Illinois and Mississippi Rivers. This 2,157-acre area consists of bottomland forest (1,379 acres), open water and emergent wetlands (466 acres), scattered agricultural fields (269 acres), and 43 acres of developed lands. The majority of the Calhoun Point site is under Federal ownership. All but 100 acres of the Federal lands were acquired about 50 years ago by the Corps, and were later designated as General Plan lands. The General Plan, dated March 1961, was approved jointly by the Assistant Secretary of the Army, the Secretary of the Interior and the Illinois Department of Natural Resources (IDNR, formerly the Illinois Department of Conservation); and as prescribed in a Cooperative Agreement, dated February 1963, between the Department of the Army and the Department of the Interior. IDNR has responsibility for day-today management of the area under the terms of a cooperative agreement with the USFWS. Current management is directed at providing waterfowl habitat, and preserving the bottomland hardwood ecosystem. Ongoing management practices rely heavily on pumping in the spring, to dewater areas for growing waterfowl foods, and on recharging these areas in the fall to make the food available to waterfowl. Sedimentation and water level fluctuations are major threats to the habitat of the Calhoun Point area. The open water areas at Calhoun Point receive substantial sediment input from the flood waters of both the Illinois and Mississippi Rivers. The existing overall deposition rate is estimated to be .5 inches per year, and is expected to average .3 inches per year over the next 50 years, resulting in a one-third reduction in open water area. Thus, this deposition has and will result in a direct loss of fish and waterfowl habitat acreage over time. It also results in decreased water depth, leaving fish without suitable refuge from temperature extremes during the winter period, and it obstructs fish access between the river and interior lakes. To some extent, sediment also contributes to a soft bottom substrate, which is not conducive to good plant anchorage. The project area is also affected by fluctuations in river stage. Water elevations can fluctuate by a number of feet above normal pool stage (419.5 NGVD), and for extended periods of time. These fluctuations can impact the growth of wetland plants, and the availability of these plants as a food source for waterfowl. Other site problems include: (a) the tendency for the slough and old meander scar areas in the vicinity of Squaw Island to dry out and become of less value to wood duck reproduction, (b) woody vegetation that occupies a considerable portion of the site's interior that could otherwise be available for waterfowl food production, and (c) approximately one-half of.the site's mast trees were killed by the 1993 flood. Because of its importance in providing habitat for waterfowl, fish and other species, the involved agencies were interested in restoring the resources and management potential of this site.en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineers.en_US
dc.format.extent837 pages / 134.46 MB-
dc.publisherUnited States. Army. Corps of Engineers. St. Louis District.en_US
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created from scans of the Print Resource-
dc.subjectRestoration ecologyen_US
dc.subjectEnvironmental protectionen_US
dc.subjectEnvironmental managementen_US
dc.subjectIllinois River (Ill.)en_US
dc.subjectMississippi River-
dc.titleUpper Mississippi River System-Environmental Management Program Definite Project Report (SL-7) with Integrated Environmental Assessment : Calhoun Point Habitat Rehabilitation and Enhancement Project, Main Report and Apendices, Pool 26, Illinois River, Calhoun County, Illinoisen_US
Appears in Collections:Environmental Documents

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