ChasingMoxie
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If she jumped into the Nehalem she wouldn't die from impact, because the bridge isn't high enough, but the water would have been fast flowing and very cold. Historic data suggests an average water temperature of around 40 degrees F for Foss, Oregon. Elsie is further inland and at a higher elevation, so probably colder than that. Additionally, with a colder than average Winter so far, I don't think it's out of the question for the water to have been in the 30s.
According to survival charts, the expected time of consciousness in water that cold is between 15-30 minutes.
Citations:
Water temp (historical data): https://waterdata.usgs.gov/or/nwis/...e&submitted_form=parameter_selection_list
Water temperature survival times: http://www.seagrant.umn.edu/coastal_communities/hypothermia
According to survival charts, the expected time of consciousness in water that cold is between 15-30 minutes.

Citations:
Water temp (historical data): https://waterdata.usgs.gov/or/nwis/...e&submitted_form=parameter_selection_list
Water temperature survival times: http://www.seagrant.umn.edu/coastal_communities/hypothermia