San Tomas Expressway

Named in 3 flood threshold descriptions published by Valley Water.

The Gauge Relationship

Every quotation below is Valley Water's own text, unedited. The captured reading and exact distance to the first threshold that names this place come before the map, so the resident answer is not hidden behind geography.

San Tomas Creek above Williams Rd

West Valley watershed · captured reading 0.51 ft · first named at threshold 2, 6.2 ft

At the captured reading, this creek is 5.69 feet below the level where San Tomas Expressway is named.

Possible overbanking onto San Tomas Expressway between Homestead Rd and Forbes Ave, where the underground culvert daylights for a short stretch.
Valley Water, threshold 2 description for San Tomas Creek above Williams Rd

Overbanking upstream of Homestead Rd spread along San Tomas Expressway moves northward and spreads into surrounding neighborhoods.
Valley Water, threshold 3 description for San Tomas Creek above Williams Rd

San Tomas Expwy flooded, with water moving northward under the I-280 viaduct toward Homestead.
Valley Water, threshold 4 description for San Tomas Creek above Williams Rd

Gauge Location

1 stream gauge whose Valley Water threshold descriptions name San Tomas Expressway. — The point marks the gauge location whose published threshold text names San Tomas Expressway; it does not claim a coordinate for the street or landmark. All eleven polygons in Valley Water's published major-watershed layer are shown. The eleven published polygons do not exactly match the portal's five sensor groups and do not provide a boundary for every named creek.

A place named here is not a flood prediction. It is what Valley Water records as at risk when a creek reaches that level. For an emergency, call 911.

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