This entry represents the confluence of two of my favorite things: running on trails and history. Meeker Island lock and dam was the first set of locks constructed on the upper Mississippi river in 1907. If you are strolling or running along the east bank of the river just where Minneapolis meets Saint Paul it has always been possible to go down some steps (in Minneapolis) or down a rutted little trail (in Saint Paul) to the riverbank and see the remnants of the dam. When the river level is low you can see a lot of what was there, if not the island itself which is submerged by the now much deeper channel of the river.
The lock and dam lasted just five years, and was then submerged by the raising of the river achieved with the construction of the much larger dam at the Ford Parkway.
Now with the centenary of the Meeker Island dam upon us, the Saint Paul city council has spruced up the area a little, added some tables and benches, and made the path alongside the river more runnable (or walkable). The best way to see this on a run is to run down the wagon road on the Saint Paul side, along the river, and then up some iron steps (beside a storm water outlet) into Minneapolis to emerge about 100 meters from where you went down the wagon road.
Lake St bridge
Minneapolis' beach on the Mississippi
Links
Wikipedia
National Parks Service book on the history of the Mississippi in the Twin Cities