In the last Ice Age — 10,000 to 110,000 years ago — what is now the Monongahela River flowed north across Pennsylvania into the St. Lawrence watershed. At some point, an ice dam gave rise to Lake Monongahela, which was 200 miles long, 100 miles wide and hundreds of feet deep. Now, a series of locks and…

Additional Info

  • Issue Quarter Winter
  • Issue Year 2016
  • Sub Heading Capturing a year on Pittsburgh’s changing river
Close Window Welcome to Pittsburgh Quarterly
Keep up with the latest

Sign up for our Newsletter, Pittsburgh Quarterly This Week.

We’ll keep in touch, but only when we think there’s something worth sharing. To receive exclusive Pittsburgh Quarterly news and stories, please fill out the form below. Be sure to check your email for a link to confirm your subscription!

View past newsletters here.

Don’t miss a story! Sign up for our newsletter to receive award-​winning journalism in your inbox.

Please let us know your name.
Invalid Input
Please let us know your email address.
Invalid Input