With concern rising that invasive Asian carp will make their way up the Mississippi River into some of Minnesota’s prime fishing waters, it appears increasingly likely that Congress will authorize the closure of a key navigational lock in Minneapolis, effectively ending the city’s days as a river port.

As the Dayton administration and environmental organizations push Congress to permit the emergency closure of the navigational locks on the Mississippi River in Minneapolis, two new government studies have detailed the potential costs of action — and inaction.

The House and Senate appear to be heading for a conference committee battle over the marquee land-acquisition proposal in this year’s Legacy bill.