1. Reload the map: To “refresh” or “reload” the map, 

just click on the browsers refresh button. F2 on your 

keyboard will return your geospatial extent to the 

default extent for your map, collapse the layer folders 

and turn off all layers.

2. Re-center the map: You can “pan”, or re-center, 

around the map by clicking on the Pan tool located 

above the map, then dragging to your point of interest 

on the map image.

3. Zoom in: You can zoom in by clicking on the 

Zoom-In tool located above the map, then clicking at 

your point of interest on the map image, or dragging a 

box that delinates your area of interest.

4. Zoom out: You can zoom out by clicking on the 

Zoom-Out tool located above the map, then clicking 

at your point of interest on the map image.

5. Go Back to the Previous View: You can return 

to the extent of previous views by clicking on the 

Previous Extent icon located above the map. There is 

no limit to how many previous views you can return to.

6. Find layer information: There are two ways to 

find more information on a layerBy default, the last layer you turned on in the layers 

list becomes the active query layer. The Active Query 

Layer is always shown on the status bar below the 

map. If the active query layer is not what you want, 

set the query layer by using the ‘Query Layer’ pulldown menu above the map. This list is now limited 

to just the layers you have turned on. Then, you can 

select the ‘PopUp Info Query’ button which will 

display the layers attributes in a bubble when you 

hover over a feature on the map. When the bubble 

pops up, you can click on any ‘Link’ and another 

web page will open. Most of the layers will have 

additional clickable links.

Alternatively, you may select the ‘Table Info Query’ 

button, which allows you to select features on the 

map by clicking and dragging on the map. 

7. See what the symbols mean: You can bring up a 

legend by clicking on the Legend bar left of the map. 

Only the layers that you clicked on in the layer list 

will be shown.

8. Print the map on the screen: You can print the 

map by clicking on the Print icon on the far right of 

the tool bar. The legend and a scale bar will also be on 

the map. After the map is produced, click File, Print.

9. Turn on/off data layers: In the layers list on the 

left side of your browser window, you may click in 

any of check-boxes to turn on a layer. Layers that are 

not appropriate to view at your current map scale will 

be ‘greyed-out’ and unavailable. When you zoom in 

further, you will see layers become available to you. 

You can then click the box to turn on the layer. You 

may check on or off as many selections as you like.

10. Change the Base Map: You can change the base 

map by selecting the basemap type from the BaseMap 

pull-down list.

11. Turn on Auto Refresh: You can have the map 

refresh automatically by clicking on the AR Off below 

the map to toggle it on. Set the Refresh Interval by 

clicking on RI to the left of the AR. 

12. Turn on an Overview Map: To toggle on the 

display a small Overview Map, click on OV Off below 

the map.

13. Search for a location: You may search by 

coordinates, addresses, zip codes, county or Google. 

After you select your search method, other options 

may become available. When the list of places is 

returned, click on one to see where the place is on 

the map. It will be marked with a green marker and a 

bubble.

14. Get a coordinate for a point on the map: You 

can click on a tool that shows you the coordinate for a 

location that you click on the map. Coordinate at Point 

Click icon located above the map. 2 15

6 10

11 12

1

8

7

5

4

3

139

MISSISSIPPI VALLEY DIVISION CorpsMap USER’S GUIDE

How To Guide

The Mississippi Valley Division 

CorpsMap can be found at:

www.mvd.usace.army.mil by 

clicking Operation Watershed.
The Operation Watershed layers depicts the 

geographic location of damages created by the 2011 

Spring Flood in the Mississippi River Valley Basin. 

The sites are color coded based off of the funding 

status:

yellow = unfunded / no construction

orange = funded / under construction

green = funded / construction complete

2011 Levee Sites: Sites with scour, erosion, 

sandboils, seepage, slides, and breaches

2011 Channel Improvement Sites: Sites including 

hardpoints, levee, dikes, channel, revetment, 

overbank, and top bank

2011 Major Structures: Sites with structural damage, 

scour to structures, debris, and erosion

The addition of (PL84-99) on the layer designates that 

the site is covered under the PL84-99 program.

Each site can be queried and will display a pop-up 

window with more information. The pop-up window 

may contain two links that launch a pdf report; a 

information report and/or a construction fact sheet. 

The information reports are write-ups of the site 

and its damage. The construction fact sheets relate 

to sites that are currently under construction and 

describes the construction status.

To query a site:

-Select the query button - - and draw a box 

around the site

-A pop-up window will display relative information and 

possible report links

-Always clear the selection when finished with one 

site

Querying site when multiple layers are turned on:

-Select the query button

-Select the drop down arrow next to the query 

buttons, then select the layer of interest

-Draw a box around the site and a pop-up window will 

display with more information

CorpsMap U.S. ARMY CORPS OF ENGINEERS

Flood Season Preparedness

The Risk Class layers are the same sites identified 

in the Operation Watershed sites. In this layer they 

are classified by their Risk classification. These 

sites can be queried and will show reports related 

to risk and flood preparedness.

Each site can be queried and will display a popup window with more information. The pop-up 

window may contain two links that can launch a 

pdf report; a risk information report and/or a risk 

management report that explains what the risks 

are and what is being done to address them. 

Risk Class 1 Site: High Potential for Loss of 

Life. Only critical repairs for breached or severely 

damaged Civil Works Projects where the 

probability of inundation combined with a probable 

loss of life results in extremely high risk.

Risk Class 2 Site: Significant Potential for Loss 

of Life and Significant Economic Damage. Only 

critical repairs for damaged Civil Works Projects 

where the probability of failure during the next high 

water event combined with the probability for loss 

of life and significant economic damages results in 

very high risk. 

Risk Class 3 Site: High Impact to Navigation or 

Indirect Potential for Loss of Life. Critical repairs 

for damages that are directly impairing safe 

navigation at high-use (over 10M tons at ports or 

2.5B ton-mile for inland waterways) systems. (e.g. 

dredging critical harbors and navigation channels, 

critical gate repairs, debris removal, etc.). It is not 

anticipated that any more than the previous 12 

months average width and depth will be restored 

during this effort. OR

Critical repairs for damaged Civil Works Projects 

where failure during the next high water event 

could potentially disrupt essential lifeline services 

or access to these services (e.g. Severe damages 

to key transportation links that would prevent 

access to medical facilities at a time critically 

injured people need access the most.)