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Geological Society of Minnesota

Geological Society

of Minnesota

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Geological Society of Minnesota

Road Marker Information

Road Marker Information

Title: THE MINNESOTA RIVER VALLEY
Road Markers

Enter Road Address in your cars GPS:
US-169, Le Sueur, MN 56058

OR
Enter Geographical Coordinates in your cars GPS:

Degrees Lat Long:      44.488367, -93.875210

Latitude:       44°29’13.2″N
Longitude:   93°52’30.0″W

Go to Google Map

Country: LeSueur County
Where Found:

Located on U.S. highway 169 in the rest area north of Le Sueur

Marker Number:114
Marker Composition: Cast Bronze on a post
Marker Notes:

Need updated marker text.

Text on Marker:

Geologically young when compared with ancient rivers such as the Nile or the Amazon, the Minnesota River is only about 12,000 years old. It occupies a channel that was cut by the Glacial River Warren, when it drained

Glacial Lake Agassiz, the largest lake to have ever existed. This all occurred at the end of the last glacial age, when the glaciers covering Minnesota, in some cases to a depth of over a mile, melted away. Starting at the South Dakota border, at Browns Valley, the Minnesota River is the state’s second largest river. It joins the Mississippi at the foot of Historic Fort Snelling, after traveling a distance of some 355 miles. By geological definition the Minnesota is an “underfit river,” the term applied when a river occupies the channel of an earlier river. While the ancient valley is up to two hundred and fifty feet deep and in places 5 miles wide, the Minnesota is just a shallow, meandering river. During flood stages it swells beyond its banks, due to runoff from its extensive drainage basin. History is abundant along its banks. Exposed by the waters are rocks that are more than 3.8 billion years old, attesting to the age of the earth. Ruins stand today as reminders of former homes, villages, military posts and sanitariums that once served the residents of the area. Indian villages and crossing sites that predate the European settlement of the region, are also found along its course. Hundreds of steamboats once slowly traveled the river. Their use ceased with the coming of the railroads. While the water flows by in an endless trip to the sea, and the life style changes with each passing year, the past will always be present here in the Minnesota Valley. 1997

Region: South Central/West Region

Information Needed:

  1. Marker Images

Condition of Marker: Good
Do it Yourself Region: Minnesota River Valley

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© 2025 Geological Society of Minnesota - WordPress Theme by Kadence WP

  • Welcome Page
  • Road Markers
  • Members
    • Seminars and Labs
      • Seminar/Lab Calendar
      • Current Year Schedule
      • All Seminars and Labs
      • Directions to Seminars and Labs
    • Fields Trips
      • Field Trip Calendar
      • Help Field Trip Signup
      • Upcoming Field Trip
      • Field Trips Signup
      • Submit Field Trip Suggestions
      • Past Field Trips
      • Waiver of Liability
      • Waiver of Liability PDF
    • Calendars
      • Seminar/Lab Calendar
      • Field Trip Calendar
    • Member Information
      • Print a Membership Form
      • Enter in your membership form, then print
      • Membership application/renewal via credit card
      • Membership Help Document
    • Media Library
      • Media Library Order/Display
      • Help Using Media Library
      • Suggested Geology YouTube Videos
    • GMS T Shirts and Caps
      • Buy T Shirt and/or Cap
      • Help buying T Shirt/Cap
    • Newsletters
      • Display Newsletters
      • NLs from the MN Geological Survey
        • Newsletter JPG Large
        • Newsletter JPG Small
      • Contributing to the Newsletter
  • Link
  • Outreach
    • For Teacher
    • State Fair
      • State Fair Booth Rock Specimens List
  • About
    • History
    • Board
      • Display Board Minutes
      • Board Information
      • GSM presidents
    • Organization Information
      • Articles of Incorporation
      • By_Laws
    • Mission
    • Administrator Login
      • Administrator Login Help
  • Contact
    • Ask GSM
    • Ask ChatGPT a geology question
    • GSM USPS mailing address
  • Display Posts
    • Display Blog Posts List
    • Display Blog Posts by Category
    • Help Viewing Blog Posts