MSDSS LTHIA tutorials and help

Process: 3 separate ways to locate your point:

A) Search / Zoom and Click "Delineate",

B) select 12 digit HUC

C) or type in your location coordinates.


Search for or Zoom-in to your area.

Select "Delineate" button and click on the stream whose watershed you plan to analyze. Your location is sent to our L-THIA engine and the watershed of that point is calculated; then you can run L-THIA model on it to predict runoff.

To enter a specific latitude- longitude select "Lat-Lon" button below , longitude with minus sign must be within -92.70000 to -87.00000 and latitude within 46.90000 to 42.00000

Select UTM Zone16 N coordinates in meters: range of X should be within 46000 to 490000 and Y within 4710000 to 5200000

Finally click Done

UTM Z16   Lat-Lon
Y (or Lat):
X(or Lon):

We are using a 10 - digit HUC watershed as the largest possible size!

(What is a 10 Digit HUC versus a 12 digit HUC?)

To run analysis on a specific 12 DIGIT HUC, click the "HUC 12" button and select the desired watershed.



This Online Watershed Delineation (OWL) tool will delineate the area that flows to pour point and allow you to send that outline, and the soil and landuse data within the outline to our online models.

Check the checkbox to display streaming WMS layer

Streaming Layer HIT Sediment HIT Erosion HUC 8, 10, and 12 layer NHD water layer