Grok, please chart me the most direct route for a flight path at 8,500 feet from KEEN to KEUG across the Rocky Mountains with the lowest altitude possible through the Rocky Mountains while bypassing the Great Lakes by while remaining in the United States.

The most direct VFR flight route from KEEN (Dillant-Hopkins Airport, Keene, NH) to KEUG (Mahlon Sweet Field Airport, Eugene, OR) at a cruising altitude of 8,500 feet spans approximately 2,300 nautical miles and takes 12-15 hours of flight time, depending on winds and stops for fuel/refueling (plan 4-5 legs with airports like ELM, MCI, LBF, and BOI as options). To bypass the Great Lakes (avoiding overwater flight over Lake Huron and Lake Michigan), the path dips south to approximately 41°N around 83°W (over northern Ohio/Indiana), then trends northwest. This adds minimal distance (~50 NM) compared to a pure great circle while staying entirely over U.S. land.

For the Rocky Mountains crossing, the route follows a low-altitude corridor through Wyoming's South Pass (near 42.4°N, 108.5°W, terrain elevation ~7,550 feet MSL). This is one of the lowest feasible passes for VFR transit across the Continental Divide, providing ~1,000 feet of clearance at 8,500 feet—well below higher alternatives like Powder River Pass (~9,700 feet) or Eisenhower Tunnel approaches (~11,000+ feet). Fly early morning for best visibility and to avoid afternoon turbulence/buildups; monitor terrain via sectional charts and maintain 500-1,000 feet above ground in the pass. West of the Rockies, the path follows valleys along I-80/I-84 toward the Columbia River Gorge for a scenic, low-elevation descent into Oregon (max terrain ~4,000 feet).
Key waypoints (VORs/airports for navigation; use ForeFlight/SkyVector for full filing):

KEEN (departure)
KELM VOR (Elmira, NY)
KPSB VOR (Philipsburg, PA; southern dip here)
KMCI (Kansas City, MO; fuel stop option)
KLBF (North Platte, NE)
KCPR (Casper, WY; pre-Rockies fuel)
LND  KSouth Pass (visual; near LND VOR/Lander, WY)
KRSS VOR (Rock Springs, WY)
KOGD VOR (Ogden, UT)
KBOI (Boise, ID; fuel stop option)
KEUG (arrival)

Below is a scatter chart plotting the route's latitude vs. longitude (simple Mercator projection approximation; x-axis reversed for west-to-east flow). Points trace the path segments, with the South Pass crossing highlighted in red for emphasis.

Always file a VFR flight plan, get flight following from ARTCCs (e.g., Boston, Cleveland, Chicago, Denver, Salt Lake, Seattle), and check weather/TAF for mountain obscuration. Consult current sectionals for exact terrain clearances.