Wisconsin Dams
Created by John Hyden
UW-Milwaukee UP794 Fall 2010
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Notes:

This map layer portrays major dams within the state bouondary of Wisconsin. The map layer was created by extracting dams 50 feet or more in height, or with a normal storage capacity of 5,000 acre-feet or more, or with a maximum storage capacity of 25,000 acre-feet or more, from the 79,777 dams in the U.S. Army Corps of Engineers National Inventory of Dams. This is a replacement for the April 1994 map layer.

"County" is the one in which the dam is located. If the dam falls in more than one county, the names may be separated by a slash, a comma, or a semicolon.

"River" is the official name of the river or stream on which the dam is built. If the stream is unnamed, it is identified as a tributary ("TR") to a named river. If the dam is located offstream, the name of the river or stream is entered plus "-OS" or "OFFSTREAM".

"City" is the name of the nearest city, town, or village that is most likely to be affected by floods resulting from the failure of the dam.

"Dam Height" is the maximum of either the dam height (the vertical distance between the lowest point on the crest of the dam and the lowest point in the original streambed), the hydraulic height (the vertical distance between the maximum designed water level and the lowest point in the original streambed), or the structural height (the vertical distance between the lowest point of the excavated foundation and the top of the dam) of the dam. The height is given in feet, to the nearest foot.

"Maximum Storage" is in acre-feet. Maximum storage is the total storage space in a reservoir below the maximum attainable water surface elevation, including any surcharge storage.

"Normal Storage" is in acre-feet. Normal storage is the total storage space in a reservoir below the normal retention level, including dead and inactive storage and excluding any flood control surcharge storage. A value of 0 may indicate that the normal storage is unknown or may indicate that the dam is normally dry.

"Surface Area" of the impoundment at its normal retention level is in acres.

"Drainage Area" of the dam is in square miles. It is defined as the area that drains to a particular point (in this case, the dam) on a river or stream.

Attribute Codes:

Hazard
LThe potential hazard is low. A dam where failure or misoperation results in no probable loss of human life and low economic and/or environmental loss. Losses are principally limited to the owner's property.
SThe potential hazard is significant. A dam where failure or misoperation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. These dams are often located in predominantly rural or agricultural areas but could be located in areas with population and significant infrastructure
HThe potential hazard is high. A dam where failure or misoperation will probably cause loss of human life.
UThe potential hazard is unknown.

Attribute Codes:

Owner Type
BlankThe name of the owner is not provided in the National Inventory of Dams.
F federalThe dam is owned by a Federal agency.
L local govThe dam is owned by a County, City, Regional, or other similar local government or government agency.
P The dam is owned by an individual or individuals, or by a private company.
S The dam is owned by a State or by a State agency.
U The dam is owned by a public utility.
Dam Type
BlankThe dam type is unknown.
CBButtress
CNConcrete
ERRockfill
MSMasonry
MVMulti-arch
OTOther
PGGravity
REEarth
STStone
TCTimber crib
VAArch
Purpose
BlankThe purpose of the dam is not provided in the National Inventory of Dams.
CFlood control and storm water management
DDebris control
FFish and wildlife pond
HHydroelectric
IIrrigation
NNavigation
OOther
PFire protection, stock, or small farm pond
RRecreation
SWater supply
TTailings