Map

area

Peachtree

Creek

N Fork

DEKALB

COUNTY

GWINNETT

COUNTY

FULTON

COUNTY

Atlanta

Chattahoochee

River

S Fork

Nancy Creek

GEORG IA

02336490

02336300

AANG1

02336300

AANG1

85

BOHLER ROAD NW

MOORES MILL ROAD NW

HOWELL

MILL

ROAD NW 

75

75

NORTHSIDE 

PEACHTREE 

ROAD NE

DRIVE NW

NORFOLK SOUTHERN RAILWAY

Suggested citation:

Musser, J.W, 2012, Flood-inundation maps for Peachtree Creek 

from the Norfolk Southern Railroad bridge to the Moores Mill 

Road NW bridge, Atlanta, Georgia: U.S. Geological Survey Scientific 

Investigations Map 3189, 9 p. pamphlet, 50 sheets; available

online only at http://pubs.usgs.gov/sim/3189/.

Scientific Investigations Map 3189

Sheet 1 of 50

Pamphlet accompanies map

Prepared in cooperation with the

City of Atlanta,

Georgia

Prepared in coordination with the

National Weather Service

http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf

U.S. Department of the Interior

U.S. Geological Survey

0 1,000 2,000 3,000 4,000 FEET

0 500 1,000 METERS

Base from U.S. Geological Survey High-Resolution 

Orthoimagery for the Atlanta, Georgia Urban Area, 2007

Transverse Mercator projection

State Plane Coordinate System, Georgia West, FIPS 1002

North American Datum of 1983 (NAD 83)

84°26'30"W 84°26'W 84°25'30"W 84°25'W 84°24'30"W 84°24'W 84°23'30"W 84°23'W 84°22'30"W

33°49'30"N

33°49'N

33°48'30"N

Flood-Inundation Map of Peachtree Creek in Atlanta, GA, Corresponding to a Gage Height of 15.0 Feet and an Elevation of 779.2 Feet (NAVD 88) 

at U.S. Geological Survey Streamgage Peachtree Creek at Atlanta, GA (02336300), and a Gage Height of 26.4 Feet and an

Elevation of 763.0 Feet (NAVD 88) at U.S. Geological Survey Streamgage Chattahoochee River at GA 280, near Atlanta, GA (02336490)

USGS streamgage and NWS 

N forecast site and identifiers

EXPLANATION

Model boundary

USGS streamgage and identifier

Flood-inundation area

02336300

AANG1

02336490

Direction of surface-water flow

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 (water-surface elevations) 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 March 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 are described in the document accompanying this set of flood inundation map plates.

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 (water-surface elevation) for the stream at a given location (Advanced Hydrologic Prediction Service [AHPS] forecast point) throughout the forecast 

period (every 6 hours and 3–5 days out in many locations). For more information on AHPS forecasts, please see: http://water.weather.gov/ahps/pcpn_and_river_forecasting.pdf.