With a single toot that reverberated through the cavernous Upper St. Anthony Falls on Monday afternoon, where minutes before 10 million gallons of water floated her 50 feet higher, the towboat Becky Sue nudged twin barges filled with 2.400 tons of scrap steel downriver.
In that same moment, Becky Sue ushered out a historic era of Minneapolis river navigation.
The commercial lock closed for good Tuesday at midnight, marking the end to 150-year-old dreams of creating a port that would rival St. Paul. But the closure now brings new hopes of transforming the city's upper river with more parks, housing and office buildings.
"Personally, I understand why it's being done and support the validity of that, but it feels bittersweet, poignant because it is the end of an era," said Ann Calvert, the city's point person on river issues for decades.
Congress mandated the shutdown in hopes of blocking the migration of invasive carp, which experts warned could tag along in the lock and then continue north and threaten sport fish populations in Minnesota's lake country.
Lee Nelson, who said he tried and failed to negotiate a compromise between politicians and the barge industry, took Becky Sue's helm for its final lockage. He has been a towboat captain since 1983, but he is now president of Upper River Services, which shuttles most of the barges on Twin Cities waterways.
His administrative duties keep him off the river most of the time, but he successfully nosed the 400 feet of barges strung out in front of him into the lock.
"He's not standing up, so he's not nervous," quipped Tom Fleming, who piloted the rest of the trip, a journey he estimates he's made a couple hundred times. Nelson feigned wiping his brow, then added: "Our job is to make it look easy."