This is from San Jose's 2004 Initial Study/Negative Declaration Environmental Impact Report, showing that even the 100-year flood was barely hip-high on the trestle.

[Note: back in 2004, the plans were to reuse the railroad ties; however, now that they're worn and rotted, the recommendation is to remove them and place the concrete-slab trail deck directly on the "stringers" (those pair of 4 Xs near the top).]