Never been there. No RV. But, I’ve been using MS Bing AI lately. It seemed to be a perfect AI type question, so I asked MS Bing.
Lot of good references!
“The best route to the Fishing Bridge area in Yellowstone National Park from Southern California depends on your starting location and the size of your RV. Assuming you are starting from Los Angeles, the most direct route is to take I-15 North to I-90 East, then take US-89 South to the park¹. However, this route includes steep grades and winding roads that may not be suitable for large RVs. An alternative route is to take I-15 North to I-84 East, then take US-20 East to US-191 North, which will take you to the park's West Entrance¹. This route is longer but has fewer steep grades and winding roads, making it more suitable for large RVs¹.
Once you enter the park, you can take the Grand Loop Road to reach the Fishing Bridge area⁴. Please note that there is ongoing road construction in the Fishing Bridge area, which may cause delays¹². It is advisable to check the park's website for the latest road conditions and closures before you start your journey⁴.
I hope this information helps you plan your trip to Yellowstone National Park!
Source: Conversation with Bing, 12/12/2023
(1) Best Route Through Yellowstone with a Large RV - Tripadvisor.
https://www.tripadvisor.com/ShowTop...rge_RV-Yellowstone_National_Park_Wyoming.html.
(2) RV Tips for Yellowstone National Park.
https://www.yellowstonepark.com/where-to-stay-camp-eat/camping-rv-parks/rv-tips/.
(3) Best Route Through Yellowstone with a Large RV - Tripadvisor.
https://www.tripadvisor.com/ShowTop...rge_RV-Yellowstone_National_Park_Wyoming.html.
(4) RV travel from GTNP to Fishing Bridge RV Park and Gardiner.
https://www.tripadvisor.com/ShowTop...rdiner-Yellowstone_National_Park_Wyoming.html.
(5) undefined.
Road to Yellowstone.
(6) undefined.
https://goo.gl/maps/4gfkjcmjphM2.
(7) undefined.
https://www.yellowstonenationalparklodges.com/content/uploads/2017/04/Park-Map-with-mileage.pdf.”
Mods if AI is not allowed, please delete.