85°11' 85°09' 85°07'

41°04'

41°02'

41°00'

012 0.5 MILES

012 0.5 KILOMETERS

Scale 1:36 000

27

04182000 04182000

27

33

TAYLOR STREET

AVE HALE AVE

MAIN ST MAIN ST

Fort Wayne Fort Wayne JEFFERSON BLVD JEFFERSON BLVD

469

04182769 04182769

STREET

HALE

BLUFFTONBLUFFTON BLUFFTONBLUFFTON ROAD

HUNTINGTON

LOWER

AIRPORT

EXPRESSWAY

SOUTH ANTHONY BOULEVARD

FERGUSON 

ROAD

FERGUSON 

ROAD

DITCH

JUNK

DITCH

FAIRFIELD

St. Marys

River

ROAD

DITCH

SNYDER

DITCH

SNYDER

EXPLANATION

USGS Streamgage and number

Limit of study area 27 U.S. route marker

Flood-inundation area

Flow arrow—Indicates direction

of water flow

04182000 04182000

Levee 469 Interstate route marker

DISCLAIMER FOR FLOOD-INUNDATION MAPS

 Inundated areas shown should not be used for navigation, regulatory, permitting, or other legal purposes. The USGS provides these maps “as-is” for a quick reference, emergency planning tool but assumes no legal liability or responsibility resulting from the use of this information.

UNCERTAINTIES AND LIMITATIONS FOR USE OF FLOOD-INUNDATION MAPS

 Although the flood-inundation maps represent the boundaries of inundated areas with a distinct line, some uncertainty is associated with these maps. The flood boundaries shown were estimated based on water stages and streamflows at selected USGS streamgages. Water-surface elevations along the stream reaches were estimated by steady-state hydraulic modeling, 

assuming unobstructed flow, and using streamflows and hydrologic conditions anticipated at the USGS streamgage(s). The hydraulic model reflects the land-cover characteristics and any bridge, dam, levee, or other hydraulic structures existing as of September 2011. Unique meteorological factors (timing and distribution of precipitation) may cause actual streamflows along the 

modeled reach to vary from those assumed during a flood, which may lead to deviations in the water-surface elevations and inundation boundaries shown. Additional areas may be flooded due to unanticipated conditions such as: changes in the streambed elevation or roughness, backwater into major tributaries along a main stem river, or backwater from localized debris or ice 

jams. The accuracy of the floodwater extent portrayed on these maps will vary with the accuracy of the digital elevation model used to simulate the land surface. Additional uncertainties and limitations pertinent to this study may be described elsewhere in this report.

If this series of flood-inundation maps will be used in conjunction with National Weather Service (NWS) river forecasts, the user should be aware of additional uncertainties that may be inherent or factored into NWS forecast procedures. The NWS uses forecast models to estimate the quantity and timing of water flowing through selected stream reaches in the United States. 

These forecast models (1) estimate the amount of runoff generated by precipitation and snowmelt, (2) simulate the movement of floodwater as it proceeds downstream, and (3) predict the flow and stage (and water-surface elevation) for the stream at a given location (AHPS forecast point) throughout the forecast period (every 6 hours and 3 to 5 days out in many locations). For 

more information on AHPS forecasts, please see: http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf.

Study

area

INDIANA

Flood-Inundation Map for Fort Wayne, Indiana 

Corresponding to a Stage of 14.00 Feet and an Elevation of 762.46 Feet (NAVD88)

at the U.S. Geological Survey Streamgage 04182000 on the St. Marys River

By

Chad D. Menke, Moon H. Kim, and Kathleen K. Fowler

2012

U.S. Department of the Interior

U.S. Geological Survey

Suggested citation:

Menke, C.D., Kim, M.H., and Fowler, K.K., 2012, Flood-inundation maps for the St. 

Marys River at Fort Wayne, Indiana: U.S. Geological Survey Scientific 

Investigations Map 3205, 7 p. pamphlet, 11 sheets, scale 1:36,000.

Prepared in cooperation with the

City of Fort Wayne, Indiana

Scientific Investigations Map 3205

Sheet 3 of 11

Pamphlet accompanies map

Projection: Transverse Mercator

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD83)

Orthophotography from Indiana University, Indiana Spatial Data Portal, Allen County, 2005, 

available at http://gis.iu.edu/ 

Publishing support provided by: Denver Publishing Service Center

Manuscript approved for publication March 22, 2012

For more information concerning this publication, contact:

Director, Indiana Water Science Center

U.S. Geological Survey

5957 Lakeside Blvd.

Indianapolis, IN 46278

(317)290–3333

Or visit the Indiana Water Science Center Web site at:

http://in.water.usgs.gov/ 

This report is available at: http://pubs.usgs.gov/sim/3205/. 

Any use of trade, product, or firm names is for descriptive purposes

only and does not imply endorsement by the U.S. Government.

This and other USGS information products are available at:

http://store.usgs.gov/ 

U.S. Geological Survey, Box 25286

Denver Federal Center, Denver, CO 80225

To learn about the USGS and its information products visit

http://www.usgs.gov/ 

1-888-ASK-USGS

NORTH AMERICAN VERTICAL DATUM 1988 (NAVD88)