Ottawa river depth varies from 12 to 119 meters deep just below the Parliament block according to one chart however, because of various man-made dams, locks, etc water levels average about 58 meters. That bridge which is nearby, most probably crosses a more shallower part of river however, I can only guess.
This river meanders over a lot of territory and even forms a sort of border between the provinces of Ontario and Quebec in one area.
It’s source is Lake Capimitchigama, in the Laurentian Mountains of central Quebec after which it flows west to Lake Timiskaming and onto the inter-provincial border area mentioned.
Most of the river is in Quebec, about 65%, and the rest in Ontario, with an overall area covered of 146,300 square kilometers ending at the junction of the Lake of Two Mountains and Saint lawrence River at Montreal, Quebec.
The deepest part of this river is at the town of Deep River( the name derived), Ontario where a recorded natural depth is 123 meters(402 feet). The town is directly across or opposite Quebec’s laurentian Mountains.
The water levels change continuously because of seasonal and weather conditions as well as hydroelectric dams on this waterway.
This my contribution for WP single word prompt:”Depth”.