FILENAME: POOL_22

DOCUMENTATION DATE: October 20, 1994

DATA THEME: WING DAMS

DESCRIPTION: Wing Dam centerlines as arcs with a complete historical database.

ABSTRACT: This coverage contains arcs representing the wing dams on the Mississippi River in pool 22. Each arcs represents the centerline of the wing dam as detailed on the 1 inch = 400 feet scale hydrographic survey sheets maintained by the Rock Island District.  A historic database detailing the amount of original construction materials used and the repairs done since that time been attached to the arcs. The database contains all repairs to the wing dams up to 1992. 

STATUS: 90% done

GEOGRAPHIC AREA: Mississippi River, pool 22.

MAP PROJECTIONS: Universal Transversal Mercator (UTM) zone 15.

MAP UNITS: meters

DATUM: NAD27

SOFTWARE VERSION: ARC/INFO v. 6.1.1 Sun Sparkstation

INTENDED USE OF DATA: This data was designed to be used as a means to locate wing dams in the Rock Island District and to be able to quickly access information pertaining to that wing dam.

LIMITATIONS OF DATA: The levee centerlines were digitized off of USACE Rock Island District Hydrographic Survey Sheets (scale 1 inch = 400 feet). The accuracy is estimated to be within 15 feet of its true location.

COVERAGE DEVELOPER: U.S. Army Corps of Engineers, Rock Island District

CORPS CONTACT: Thomas DeWitte, US Army Corps of Engineers, Rock Island District, Operations Division, Clock Tower Building, P.O. Box 2004, Rock Island, IL 61204-2004. Phone # (309) 794-5674.

ORIGINAL SOURCE INFORMATION: 
	MEDIA: Paper copy of map.
	AUTHOR/AGENCY: U.S. Army Corps of Engineers
	PUBLISHED DATE(S): 1984-1993
	SCALE: 1:4800
	PROJECTION: Stateplane

PROCEDURE USED TO CREATE THE DATA:.  Wing Dam centerlines were digitized on an ALTEK digitizing table using the software ARC/INFO.  ARC/INFO software was then used to project the digitized stateplane coordinate coverage to UTM zone 15 coordinates.
	
COMMENTS: None

ARC Attribute File Items (AAT)

LENGTH:	        Length of arcs in meters. (Computer generated)

POOL_11#:	A computer generated unique identifier.

OLD_DAM#:	The old dam number is a number assigned to the wing dam on the
 		original hydrographic survey sheets. This number is unique only
                on its individual sheet. On average 10 to 20 sheets are needed
                to cover the entire pool.

NEW_DAM#:	The new dam number is based on river mile. It also is not unique
                by itself. Often two wing dams, one on each bank, are at the
                same river mile.

DAM_TYPE:	This is a one letter description. Detailing which bank the wing
                dam is on and whether it is a closing dam, which completely
                banks a side channel or a main channel diversion wing dam.
                The options are as follows:
		R   = Right bank
		L   = Left Bank
		CR = Closing Dam, Right Bank
		CL = Closing Dam, Left Bank
		LR = Left and Right Bank

	
YEAR BUILT:	The year in which the wing dam was originally built.
	
DESIGN_ELEV:	The original design elevation to which the wing dam was
                originally built. Elevation is stated in terms of feet above
                sea level.(M.S.L. 1912)
	
RECENT_SURVEY:	The most recent year in which a detailed hydrographic survey
                of the wing dam was performed
	
REC_LENGTH(FT)	The measured length recorded from the most recent survey.
                (See attribute 'RECENT_SURVEY' for the year that in which
                this length was recorded.)
	
RECENT_ELEV	The average elevation along the length of the wing dam as
                measured during the most recent survey. (See attribute
                'RECENT_SURVEY' for the year that in which this length was
                recorded.)
	
RECENT_REPAIR	The most recent type of repair work performed to the wing dam
                and the year in which it was performed. An abbreviation code
                describing the type of repair is as follows:
		REP = Repaired
		EXT = Extended
		RA = Raised
		REM = Removed
		WID = Widened
		REB = Rebuilt
		PAV = Paved
		A typical entry may look as follows:
                REP 1976  = repaired in 1976
    		REM 200' 1941 = removed 200 feet in 1941.

OTHER_REP_WORK	This is a running tally of all of the repair work done since
                initial construction and prior to the most recent repair. The
                abbreviations used are as follows:
 		REP = Repaired
		EXT = Extended
		RA = Raised
		REM = Removed
		WID = Widened
		REB = Rebuilt
		PAV = Paved
		A typical entry may look as follows:
                REP 1976 REM 200' 1941 REP 1894

PRES_CONDITION	A grading scale description of the overall condition of the
                wing dam as noted during the most recent survey  (See attribute
 	        'RECENT_SURVEY' for the year that in which this length was
                recorded.) Grading scale descriptors are as follows:
        	good
		fair
		poor

ORIG_ROCK(CY)	The total amount of rock used in the original construction of
                the wing dams as measured in cubic yards.

ORIG_BRUSH(CY)	The total amount of brush used in the original construction of
                the wing dams as measured in cubic yards.

ORIG_SAND(CY)	The total amount of sand used in the original construction of
                the wing dams as measured in cubic yards.

ROCK<1937(CY)	The total amount of rock added to the wing from the time of
                construction up to 1937. (1937 marks the raising of the upper
                Mississippi from a 6ft channel to a 9ft channel) as measured in
                cubic yards.

BRUSH<1937(CY)	The total amount of brush added to the wing from the time of
                construction up to 1937. (1937 marks the raising of the upper
 		Mississippi from a 6ft channel to a 9ft channel) as measured in
                cubic yards.

SAND<1937(CY)	The total amount of sand added to the wing from the time of
 		construction up to 1937. (1937 marks the raising of the upper
 		Mississippi from a 6ft channel to a 9ft channel) as measured in
                cubic yards.

ROCK>1937(TNS)	The total amount of rock added to the wing from 1937 to present.
 	        (1937 marks the raising of the upper Mississippi from a 6ft
                channel to a 9ft channel) as measured in cubic yards

NOTICE:  The U.S. Army Corps of Engineers assumes no responsibility for errors in the information.  Similarly the U.S. Army Corps of Engineers assumes no responsibility for the consequences of inappropriate uses or interpretations of the data made by anyone to whom this data has been made available.  The Corps bears no responsibility to inform users of any changes made to this data.  Anyone using this data is advised that precision implied by the coverage may far exceed actual precision.  Comments on this data are invited and the Corps would appreciate that documented errors be brought to staff attention.