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by Paul Stumes, P.Eng.

In 1905 two steel-truss bridges were erected over the RIdeau River across Green Island, near the Rideau Falls. These bridges shortened the route, from the Parliament Buildings to the Prime Minister's residence, into a convenient drive along Sussex.

After almost 50 years of service, the bridges were found to be too narrow for the increased flow of traffic and not strong enough for the heavier load; consequently in 1954 the present two Bytown bridges were built in their place. These were constructed of pre-cast post-tensioned concrete "T" girders over reinforced concrete piers standing on bedrock.

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Both bridges underwent major rehabilitation in 1975, but a detailed survey carried out in 1990 resulted in the reduction of the allowable load on the bridges. However, in 1992 and 1997, further repairs became necessary. Recently it was realized that the Bytown bridges had reached the end of their useful life and their replacement was deemed necessary.

In 2001 a project group was established to prepare for the design of the new bridges. The work will be carried out by DELCAN Corporation under the guidance of the City of Ottawa and the National Capital Commission. Heritage Ottawa and the Local Architectural Conservation Advisory Committee (L.A.C.A.C) will participate in the project in an advisory capacity.

The new bridges, which will be integral parts of the Sussex Drive section of the planned Confederation Boulevard, will have increased load bearing capacity and will take into consideration the needs and safety of all users, pedestrians, cyclists and vehicle operators.

At the latest Planning Committee meeting, the representative of a delegate suggested that the new bridges be constructed to the same design as the original 1905 steel-trusses. At the recommendation of Heritage Ottawa and Ottawa L.A.C.A.C. this alternative was rejected. Instead of replicas, the new bridges will complement the present environment of the site.

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