Trent Severn Locks 20-34 [Show slideshow] The Ashburnham Lock Entrance to the Peterborough Lift Lock Looking up at the "pan" on the other side Stairs leading up to central control tower Door is closed and locked behind us And up we go Up! Looking across at the other lock pan going down Up!!! Happy that we are almost done. And finally at the top! Country side from 70' up Control tower Door is dropping down Swing bridge opening for us Love the calm days Nassau Mills lock You can really see the beam construction. Each of those beams are 12" x 12" From the top of the lock, we are waiting "on the blue line" for our turn 1234►