Lock & Dam #3
Mississippi River Lock & Dam
Welch, Minnesota

Lock & Dam #3

• Structure: Lock & Dam #3.
• Location: River Mile 796.9
• Dam Width: 3,950 Feet Overall, 365 Foot Wide Dam Structure.
• River Elevation (Pool): 675 Feet.
• River Elevation (Outflow): 667 Feet.
• Water Fall: 8 Feet.
• Annual Lock Traffic: 12,791 Vessels, 7,301,000 Tons (2005).
• Date Opened: July 1938.
Lock & Dam #3 is somewhat unique in that the dam itself is not very long, while the river itself is rather wide. The bulk of the structure consists of earth embankments.

The structure is located just south of the Prairie Island Indian Reservation, home of the Treasure Island Resort & Casino. The Prairie Island Nuclear Power Station is just north of the dam, and just south of the casino. The power plant has been a sore spot with the Indian community for many years. Despite a good operating record, the Indians would like the power plant removed. The power plant supplies nearly half of the electricity to the twin cities area, so a shutdown is not in the cards. As a result, the Indians declared the reservation to be a non-nuclear area. This prevented the power company from using the access road through the reservation. As a result, Northern States Power was forced to build a new access road that skirted the boundary of the reservation.

The fifth photo below shows the power station in the distance just upstream from the lock & dam. Also visible in that photos is the curve in the river leading up to lock entrance. This curve has a significant draft current that pushes towards the middle of the river. This has resulted in a large number of accidents were tows get away from the river pilots, and head into the dam rather than into the lock.


Lock & Dam #3
Lock & Dam #3
Lock & Dam #3
Lock & Dam #3
Lock & Dam #3
Lock & Dam #3

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Photo and text by John A. Weeks III, Copyright © 2005, all rights reserved.
For further information, contact: john@johnweeks.com