Accession Number : ADA260761


Title :   Environmental Assessment. Wing Dam Improvements at Johnson Island Pool 18, Mississippi River, Des Moines County, Iowa


Corporate Author : ARMY ENGINEER DISTRICT ROCK ISLAND IL


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a260761.pdf


Report Date : Jul 1992


Pagination or Media Count : 63


Abstract : The purpose of this Environmental Assessment (EA) is to address the effects of new construction proposed as part of navigation channel maintenance. Navigation channel maintenance includes periodic repair of existing training works or regulating structures, e.g., wing dams and closing dams, as well as modification of these structures. These actions generally involve large-grade limestone rock placement. Modification may include the raising, lowering, or notching of these structures to optimize their performance in flow control and sediment transport. Also, navigation dams and appurtenant structures require periodic rock placement for repair or improvement of bank protection.


Descriptors :   *MAINTENANCE , *MARINE ENGINEERING , *CHANNELS(WATERWAYS) , ENVIRONMENTAL IMPACT , NAVIGATION , DAMS


Subject Categories : Civil Engineering
      Water Pollution and Control


Distribution Statement : APPROVED FOR PUBLIC RELEASE