Bear-resistant food storage is mandatory on both sides of the divide. The Bridger-Teton order covers the whole Pinedale Ranger District and the Bridger Wilderness (the approach); the Shoshone order SHO-23-002 covers the Popo Agie Wilderness (the Cirque itself). Both run Mar 1 – Dec 1. A hard-sided IGBC canister satisfies both without parsing the fine print — Ursacks are accepted on the Bridger-Teton side. Canisters rent from the Pinedale Ranger District office.
Stage 1 fire restrictions are in effect forest-wide on the Bridger-Teton as of 22 July 2026. No campfires outside the permanent metal or concrete pits at developed recreation sites — which means no fire at your basecamp. A stove fuelled by liquid or gas that can be turned on and off is explicitly allowed, used on ground cleared of flammable material for three feet around it. Your canister stove is fine; it's also now your only source of heat and hot water, so don't under-pack fuel.
No permit for a party of two on foot. The Bridger Wilderness requires free permits only for organized groups and recreational livestock users. No fee at Big Sandy trailhead. The forest-wide stay limit is 14 days in any 30-day period within a five-mile radius, so a 4–5 night trip is nowhere near it.
Lonesome Lake has an extra camping setback on top of the standard Popo Agie 200-ft-from-water/trail rule. The commonly quoted figure is a quarter mile, but that number is repeated by guidebooks and blogs rather than any official page I could load — treat a quarter mile as the conservative assumption and confirm the current special order with the Shoshone NF before you pitch. The lake has a well-documented human-waste contamination history; draw water from inlet streams regardless, and pack your waste out.
Call the Pinedale Ranger District: 307-367-4326. Confirm Big Sandy road conditions and whether restrictions have escalated past Stage 1. Thirty-plus miles of washboarded dirt, slick when wet, no services: full tank, and a spare you've actually checked.
No cell service anywhere past the trailhead. The satellite messenger is a safety item, not a gadget. Afternoon thunderstorms are the rule — alpine start, hard turnaround time, rain shell in the summit pack every single day.