Inundation maps created spring, 2019 for the Mississippi River along the Scott County, Iowa boundary.

Source DEM was the 2008-2010 State of Iowa LIDAR data. River elevations were modified to ensure proper river surface modeling.

River elevation was derived from eleven profile measurements found in a U.S. Army Corps of Engineers flow study completed in 2004.

River elevations were converted to NAVD88 verrtical datum and correlated to the river stage at Rock Island Lock and Dam 15 gauge.

The map is intended as a inundation reference for local flood preparation and response. It is an estimate and should not be construed as a precise model. Local measurements and observations should be used to determine actions.

PLSS of Scott County including townships (both political and survey and/or geographic), sections, quarter sections, quarter-quarter sections. Note that the Scott County PLSS corner point features (both surveyed and non-surveyed/indexed) are available in the Scott County GPS Control and PLSS Corners web service.

Scott County PLSS corners originally occupied between 2007-2010 and originally referenced to Iowa State Plane, South NAD83 (HARN96) coordinate system. In 2015, a township level positional analysis and readjustment to NAD (2011) was conducted by a third-party survey firm.

Water features of Scott County, Iowa including rivers, lakes, streams, ponds, etc. Originally derived from LIDAR collected in 2005 and subsequently updated as needed via manual line edits. Also includes river mile markers for the Mississippi River including half miles.

These feature layers represent the environmental constraints within the project study area for the Interstate 80 project in Scott County, Iowa.

These feature layers represent the environmental constraints within the project study area for the Interstate 80 project in Scott County, Iowa.