The attributes that make this building unique include the circular plan, the engaged inverted engaged catenary arches on the lower wall and the taller engaged catenary arches on the upper wall with fins that extend beyond the original roofline. Unfortunately, the recently added metal penthouse (or cap on top) obscures these fins from view and diminishes the brilliant original design that you can see at http://commons.wikimedia.org/wiki/File:Pumping_station_in_Ashbridges_Bay_Toronto.jpg. This pumping station is officially known as the Mid-Toronto Interceptor Pumping Station but being a part of the Ashbridges Bay Treatment Plant, it goes by the name Building T.
To learn more about the history of the John Street Roundhouse, come to a talk this Saturday: http://ow.ly/HZuho
The Peterborough Lift Lock lifts ships 19.8 metres (max 30.5 m long, max 7.3 m wide, max 99,000 kg). The 386 km waterway (with 45 locks and 39 swing bridges and 20 km of man-made channels), is a Canadian National Historic Site and takes 5-7 days to traverse. Construction begain in 1833 and by 1920 a ship could travel from Lake Ontario to Lake Huron. At the time it was built, it was the largest un-reinforced concrete structure on Earth.
In 1985, a second bridge (behind) was added to double traffic capacity. This second bridge is unimpressive compared to the original and does not compliment it in anyway.
Could you imagine using the portable toilet near the top of the platform rigging on a cold windy day?