Flash Flood — Grand, Colorado

2021-07-30 · near Grand Lake, Grand, Colorado

$25K

Property damage

Event narrative

Flash flooding along Tonahutu Creek forced the shut down of Grand Lake's hydro plant.

Wider weather episode

Flash flooding occurred on Tonahutu Creek. Trees, mud and debris shut down Grand Lake's hydro plant. Approximately 50 downed trees piled up at the plant's head gate and ash and mud filled the ditch leading to another gate. Another flash flood impacted CO-125. Additional flash flooding occurred in the Calwood and Cameron Peak burn areas, where up to 2.5 inches of rain fell in one hour. In Erie, heavy rain anywhere from 3.5 to 4.5 inches, produced flash flooding. Several vehicles were stranded in intersections and had to be rescued. Severe thunderstorms also produced hail up to quarter size in Larimer County.

View location on OpenStreetMap → (40.2600, -105.8500)

Source: NOAA Storm Events Database, event_id 975290. Narrative written by the NWS forecast office that issued the report.