The inscription is from Homer's Odyssey: "to many foreigners on a wine-dark sea". No clear explanation of what that quotation is supposed to mean on this bridge.
And then there is this:
"This river I step in is not the river I stand in", an allusion to Heraclitus on a bridge that crosses the Don Valley on Queen Street East in Toronto. No more comprehensible -- and why the allusion, rather than the exact quote? -- but equally charming.