Allegheny River

Chris Squire / 90.5 WESA

The Allegheny River remains frozen, and there is still ice on the Monongahela and Ohio Rivers, though barge traffic is getting through. Now, with rain forecast for the next couple of days the concern turns to flooding.

“There’s always a threat of flooding, particularly when you have ice and when it starts to move it can jam up in narrow valleys or behind bridges and cause water to rise behind the jam very quickly,” said Lewis Kwett, hydraulic engineer with the Pittsburgh division of the U.S. Army Corps of Engineers.

Mark Nootbaar / 90.5 WESA

With Pittsburgh being plunged into arctic temperatures for much of February, the rivers have seen more ice than usual. Pittsburgh’s ports and waterways are among the largest inland ports in the country – so the slowdowns caused by the ice are causing some ripple effects. Locks on the Monongahela and Ohio Rivers are still operating – though the ice is slowing traffic.

Flickr user Ronald Woan

State Sen. Randy Vulakovich (R-Allegheny) said when he was a kid, people often warned him not to get to close to Pittsburgh’s three rivers. But the polluted industrial riverfronts of generations past have slowly been replaced by family-friendly recreational opportunities and big-ticket development projects such as PNC Park and South Side Works.

Flickr user Todd Shirley

Heth’s Run Valley hasn’t been much of a valley for a while. The area underneath Heth’s Run bridge—a portion of Butler Street between Morningside and Highland Park—had long been a dumping site for industrial waste. City Councilwoman Deb Gross, whose district includes the area, said many of her constituents didn’t even know a bridge was there.

But that area is slated to get a major facelift, which Gross said has been a long time coming.

The subzero temperatures this week brought not only frostbitten fingers and high heating bills, but a major ice jam along the Allegheny River.

Now, another shift in weather is expected to send the blockage downstream.

The quarter mile long buildup is thought to be 5-to-6-feet high and is located just upriver from New Kensington’s Ninth Street Bridge.

The National Weather Service is predicting mild rainfall this weekend and temperatures are expected to exceed 50 degrees.