Roads in northern portion of Yellowstone National Park CLOSED temporarily due to heavy flooding, rockslides, extremely hazardous conditions. See
https://www.nps.gov/yell/learn/news/220613.htm for more info. Some of the roads may be closed for an extended period of time due to the damage.
The current descriptions of the road closures do NOT affect the TransAm or Parks, Peaks, and Prairies routes, but NPS is currently "assessing damage" on these southern roads and more rain is expected.
All entrances to the park are closed and vehicles are being turned away at the entrances.
We will continue to update as more information is learned.
On the Parks, Peaks, and Prairies route, if heading eastbound, beginning in West Yellowstone you will need to follow the Teton Valley Alternate.
TETON VALLEY ALTERNATE: This 139.3 mile alternate to avoid the Park begins in West Yellowstone, MT, and heads west, south and east through Idaho into Wyoming. Here is the link: ridewithgps.com/routes/35560313. You'll ride 36 miles on US 20 through Montana and Idaho. The highway has variable shoulder widths, and continuous rumble strips in Idaho. It also has fast moving traffic. In both Idaho and Wyoming there will still be traffic, but we have routed onto several separate bike paths where possible. The Idaho state highways are mostly narrow, and have minimal to no shoulders. The alternate ends in Jackson, Wyoming, where you will follow routing to rejoin the main Parks, Peaks, and Prairies route in Ten Sleep on this link:
https://ridewithgps.com/routes/39859124. Here is a pdf that lists services on the Teton Valley Alternate:
https://www.adventurecycling.org/default/assets/Image/Routes_Maps/Addenda/Teton_Valley_Alternate_services.pdf
