1. The definite article denotes superlatives but it's also possible to put an a before 'most terrific'. In this case the meaning changes to 'very terrific' which sounds kind of strange here but is correct grammatically.
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Ivanhr2. As far as I know the name of a bridge usually takes a definite article before it.In the USA many bridges take the article, in Britain the opposite is true: London Bridge, Waterloo Bridge. The attribute before the name of the bridge in the original poster's question justifies the article.