Flash Flood — Fremont, Wyoming

2025-07-30 · near Moneta, Fremont, Wyoming

Event narrative

WYDOT employee reported water was 4 feet deep flowing across the highway near Frenchie Draw. Water was on road for about 2 hours, which was the length of the closure. Damages estimated.

Wider weather episode

During the late evening of July 30, 2025, numerous thunderstorms developed over the Moneta area to the east of Shoshoni, WY and to the north of Highway 20/26. Radar derived rainfall estimates between 7 PM and 11 PM MDT were 2 to 3 inches, with an additional 1 inch of rainfall estimated the day before (July 29). This caused the highway culverts for Frenchie Draw to be overwhelmed. WYDOT employees at the time observed water 4 ft deep flowing across Highway 20/26 near Frenchie Draw, prompting a closure of the highway for approximately 2 hours, after which time water receded. WYDOT made repairs in Sep 2025 to backfill areas of washout along the road.

View location on OpenStreetMap → (43.1526, -107.6760)

Source: NOAA Storm Events Database, event_id 1295616. Narrative written by the NWS forecast office that issued the report.