West Black Ridge Trail runs along the basalt-capped ridge south of St. George, between the Bloomington bench and the Virgin River corridor. The trail is a mixed-use route — hikers, mountain bikers, occasional trail runners — that climbs onto the ridge top, follows it for a couple of miles past viewpoints and unsigned petroglyph panels, and either loops back via a parallel line or extends further south toward the Arizona Strip.
The basalt-on-sandstone setup
The ridge is a classic Washington County geology cross-section: Navajo sandstone on the bottom, a basalt cap on top from the same Quaternary volcanic sequence that built the Black Hill and the Snow Canyon Lava Flow. The basalt is harder than the sandstone underneath, so the ridge has stayed elevated while the surrounding terrain eroded out from beneath it. The walk up onto the cap from the Bloomington side is the kind of geology lesson you can do with your feet — sandstone underfoot, then basalt cobbles, then a flat black-rock cap with views in every direction.
The petroglyphs
Several petroglyph panels are scattered along the ridge, most of them on the sandstone underneath the basalt cap rather than on the cap itself. The BLM does not signpost them. Locals find them by knowing where to look or by walking carefully and watching the rock faces. The same rules apply as at Anasazi Valley: don’t touch, don’t add anything, don’t trace, don’t share specific GPS coordinates publicly. The site is an unspectacular but real cultural-resource zone and the BLM’s preference is for respectful low-key visitation.
What the walk feels like
Open desert with very limited shade. Black basalt rubble underfoot through the upper sections — ankle-rolling terrain that requires actual attention. Open views of the Virgin River basin to the north and the desert running toward Arizona to the south. A few junipers on the ridge cap. The four-mile round-trip is a comfortable morning if you start early; longer extensions south toward Apple Valley and the Arizona line turn it into a half-day or more.
Sharing with bikes
The trail is open to mountain bikes and gets some use as a connector to other trails in the south St. George / Bloomington network. Bike traffic isn’t heavy compared to Bear Claw Poppy or Stucki Springs, but expect to see riders. Hikers should listen for them on the blind ridge corners and step aside on the rubble sections where neither party can go fast.
Tortoise habitat applies
This is still Red Cliffs NCA. Leashed dogs only, on-trail travel, no collecting. The ridge is less core tortoise habitat than the lower benches (tortoises don’t love basalt rubble), but they do use the sandstone underneath the cap, particularly in the cooler shoulder seasons.
The summer warning
The basalt cap retains heat aggressively. Like the Snow Canyon Lava Flow Trail, surface temperatures on the black rock climb past 130°F in summer afternoons. No water, no shade, no easy bail-out — once you’re on the ridge, the only way down is the way up. October through April is the realistic window.
Where it fits
West Black Ridge is one of the less-traveled trails on the south side of St. George. It’s not on most tourist itineraries — the ridge isn’t visible from the main highways, the trailhead isn’t dramatic, the destination is “more ridge.” But for locals who want a longer, quieter walk than Bear Claw Poppy or the Stucki Springs network offers, it’s a real option. The petroglyphs and the geology make it more interesting than the casual user might expect.