"Chasing high-alpine adventure in Colorado? The Tunnel Lake Trail delivered BIG time! 🏔️✨ This moderate 5.6-mile lollipop loop in San Isabel National Forest climbs ~1,500 ft along an historic narrow-gauge railroad grade—past crumbling mining ruins, old train tunnels, and wildflower meadows buzzing with marmots. The payoff? A stunning turquoise alpine lake at 12,000 ft, framed by jagged Continental Divide peaks and endless valley views. Bighorn sheep sightings and thin-air thrills included! Best June–Sept: start early, pack layers, and watch for afternoon storms. High-clearance vehicle recommended for the rough road to the trailhead. Who's adding this to their Colorado bucket list? Drop a 🏞️ if you've been or plan to go! Full trail guide:
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