A heavy draw-down of water from Jackson Lake is impacting boating on the lake already. According to Grand Teton National Park, visitors, boaters, and river users should expect impacts to some recreational activities, including modified operations at lake marinas, from the expected drawdown of Jackson Lake.
Due to very low natural flows and the need to supplement downstream reservoirs, Jackson Lake is expected to drawdown rapidly to levels only seen three times in the last thirty years. Consequently, park concessions with marina facilities, including Grand Teton Lodge Company and Signal Mountain Lodge Company, are modifying operations in accordance with forecasted lake level changes.
The Colter Bay boat ramp is expected to close to motorized vessels today. The ramp will still be accessible to vessels that can be hand carried. The other marinas are expected to follow suit before long. Meanwhile, the public is advised to use caution when recreating on Jackson Lake and the Snake River downstream of Jackson Lake Dam.