William Wallace Bass spent thirty years building a business out of trails, cable trams, and a canyon most people thought was just scenery. Buried in that business was an asbestos claim in a side canyon named for the Colorado River itself — ore good enough that buyers in China and France paid to fireproof their theater curtains with it. A century later, the National Park Service still won't let you within 500 feet of what's left.

The short version

• William Wallace Bass filed a dozen-plus copper and asbestos claims along his own rim-to-rim trail network from the late 1880s through the early 1900s, stockpiling ore each winter.
• His main asbestos operation was in Hakatai Canyon, developed with a partner named John Waltenberg and served by a cable tram Bass built across the Colorado River.
• Bass timed his one big payday well: he shipped his high-grade ore during World War I, when mineral prices spiked, grossing roughly $10,000 in copper and selling six tons of asbestos at $1,500 a ton.
• He sold his valid claims outright in 1926 for $25,000 and retired to Wickenburg, Arizona, where he died in 1933.
• EPA lists the Bass Asbestos Mine site in its Superfund database, but it was never placed on the National Priorities List — it carries a “no further remedial action planned” designation, not an active federal cleanup.
• The current park rulebook closes the ground within 500 feet of the mine and its tailings to the public, citing both a significant cultural resource and public health risk from high asbestos fiber levels.

A trail-builder who also mined

Bass arrived in Williams, Arizona Territory in July 1883 and settled on the South Rim as one of the area’s first non-Native residents, years before the railroad or the national monument existed. He made his living building and running trails — rim to river, river to rim, eventually rim to rim — for tourists, pack strings, and hunting parties. Mining was folded into that same operation rather than separate from it: Bass filed on more than a dozen copper and asbestos claims along his own trail network and spent winters hauling out what he could.

By 1906 he’d built a cageway across the Colorado River strung on four steel cables, used to move tourists, animals, and hunting parties — and, per his own trail’s dual purpose, asbestos ore from his mines. It’s a useful snapshot of how marginal most Grand Canyon mining actually was in this era: the tourist trade and the mineral claims ran on the same infrastructure because neither one alone paid the bills.

The Hakatai Canyon operation

Bass’s main asbestos venture was in Hakatai Canyon — “Hakatai” is reportedly the Havasupai word for the Colorado River itself — where he partnered with John Waltenberg to develop the claim. By his 1917 retirement, Bass had built a second cable tram across the river specifically at Hakatai Canyon to move the ore out, in addition to whatever else his other river crossing near Shinumo Creek, about two and a half miles upstream, handled for his broader operations.

The timing mattered more than the engineering. Bass got his highest-grade ore out and shipped during World War I, when wartime demand pushed mineral prices up across the board. He grossed roughly $10,000 on copper and sold six tons of asbestos — at $1,500 a ton — to buyers as far away as China and France, plus customers in the eastern United States. Some of that French-bound asbestos went into fireproofing theater curtains, a detail preserved in a period photo caption of Bass and a helper “high-grading” ore at Hakatai Canyon around 1900.

For context: other prospectors of the era, men like Pete Berry and Ralph and Niles Cameron, filed hundreds of claims along the South Rim, and most were bogus — filed just to tie up land that might someday prove valuable, not because anyone intended to mine them seriously. Bass’s operation, by comparison, actually produced and actually sold ore. That put him ahead of most of his contemporaries, even if “ahead” still meant a few tons of asbestos and a modest copper haul over three decades of work.

Cashing out

Bass’s nest egg came less from digging than from selling. In 1926 he sold his valid mining claims outright to the Santa Fe Land Improvement Company for $25,000, on top of what he’d already made shipping ore during the war. That sale funded his family’s retirement to Wickenburg, Arizona, where Bass died in 1933 — sources give the date as either March 7 or simply “1933,” with no material dispute about the year. (His birth year is similarly inconsistent across sources — 1848 in one archival finding aid, 1849 in a biographical summary — a small discrepancy that doesn’t affect anything else in his record.)

What’s actually off-limits (and why)

The Bass Asbestos Mine shows up twice in the current Grand Canyon National Park Superintendent’s Compendium, the park’s official closure rulebook — once as item 2 and again, worded almost identically, as item 27. Both close the ground within 500 feet of the mine and its associated tailings, in Hakatai Canyon, to public entry without special written permission from the superintendent, under 36 CFR § 1.5(a)(2). The park’s own explanation cites two things at once: protecting a significant cultural resource, and protecting public health because of high levels of asbestos fiber, plus employee safety for anyone who does have to work near the site.

River travelers get a second, overlapping rule: the compendium separately bars visitation to the ground “immediately surrounding the mine, talus slope, and camp” at River Mile 111.4, specifically because of the asbestos hazard. And underneath both of those site-specific rules sits the park’s blanket policy on every mine within its boundaries — Bass’s included — which defines “mine” broadly (adits, shafts, pits, tunnels, prospects, tailings piles) and closes all of them to public presence, use, and access without a permit, citing sensitivity and danger.

What’s notably absent is anything resembling Orphan Mine’s decades-long federal cleanup saga. EPA’s Superfund database lists a site profile for the Bass Asbestos Mine (EPA ID AZD981680309), but it’s flagged NFRAP — “no further remedial action planned” — and was never placed on the National Priorities List. No public record found this session describes a phased federal remediation program here comparable to Orphan Mine’s. As far as the documented record goes, the 500-foot buffer and permission requirement is the operative protection, not an active cleanup. See the general rundown of what’s closed and why across the park for how that compares to other restricted sites.

Sources

1. Mining — Nature, Culture and History at the Grand Canyon (Grand Canyon Historical Society)
2. Mile by Mile: Hakatai Rapid — Western River Expeditions
3. William Wallace Bass biography — kaibab.org (Grand Canyon Prospector-Pioneer Society)
4. Bass Asbestos Mine Superfund Site Profile (EPA ID AZD981680309) — U.S. Environmental Protection Agency
5. Grand Canyon National Park Superintendent's Compendium, effective June 16, 2026 — National Park Service

Shinumo Creek gets one sentence in the current closure rulebook: no camping within 100 yards of where it meets the Colorado. The creek's real story is a rusting cable line sixty feet above the river, an orchard planted in ditches somebody dug centuries before Arizona was a state, and a Cold War-adjacent Park Service crew that finally tore the whole crossing down in 1937.

The short version

• The Superintendent’s Compendium bans camping within 100 yards of the Shinumo Creek / Colorado River confluence, River Mile 109.2 — a narrow, specific setback, not a full closure.
• Long before that rule existed, Shinumo Creek was the anchor of pioneer William Wallace Bass’s inner-canyon operation: a tent camp, garden, and orchard on the river’s north side.
• Bass strung a cable crossing over the Colorado there to link his South and North Bass Trails — completing, by most accounts, the first rim-to-rim trail system in the canyon.
• A U.S. Geological Survey photograph confirms the cable crossing existed by 1908; NPS records list it as dismantled in 1937.
• Bass’s garden grew in ditches Native American farmers had already dug at the site, next to cliff dwellings and granaries — the creek was doing double duty as an agricultural resource for a very long time before 1900.
• What’s on the ground today, per the Grand Canyon Historical Society, is ruins: stacked stones, cable strands cemented into schist, and scattered household and mining implements — no working crossing, no functioning camp.

What the current rule actually says

The Superintendent’s Compendium — the park’s standing rulebook, reissued June 16, 2026 — handles Shinumo Creek in its river-trip permit section, in a list of restrictions “generally listed sequentially by river mile.” The Shinumo entry is short: “Camping is prohibited within 100 yards upstream or downstream of the confluence of Shinumo Creek and the Colorado River (River Mile 109.2).” That’s it. No stated reason, no habitat citation, no cultural-resource language — just a river-mile marker and a hard number. It sits between the Hance-to-Pipe-Creek exchange-camp rule upstream and the Bass Mine asbestos closure just a couple of river miles downstream, in company with the rest of this project’s river-corridor entries: Elves Chasm, Tapeats Creek, and the rest of the project overview.

A 100-yard camping setback at a creek mouth is a common shape for these rules — it keeps boat traffic from trampling the same narrow strip of vegetation and beach every night rather than closing the whole drainage. It’s a much lighter touch than the total closures this project has already documented at places like Elves Chasm or the Hopi Salt Mines — Shinumo Creek isn’t fenced off, it’s just not a campsite.

The Bass operation

The rule exists at a spot that used to be a lot busier. William Wallace Bass started his Grand Canyon camp in 1884 — tents on wood floors, with a big circus tent doubling as the mess hall — and over the following decades built something like 50 miles of trail and nearly 150 miles of road in the area, running stage service from the rail towns of Williams and Ash Fork out to his settlement. He built the South Bass Trail down to the river in the 1890s, then in 1899-1901 pushed a northern extension — originally called the Shinumo Trail, now known as the North Bass Trail — up the far side to the North Rim. Bass wasn’t cutting entirely new ground; he improved on older Indigenous routes and on paths a prospector named White had already worked in the 1860s and ’70s. Completing that northern leg gave the Grand Canyon its first rim-to-rim trail system, and Shinumo Creek sat right at the hinge point.

On the creek’s north bank, Bass ran a real operation, not just a waypoint: a stone fireplace, a red sandstone slab set on rock supports as a table, and gardens growing melons, cantaloupes, grapes, onions, corn, squash, and beans, plus an orchard. None of that was planted on virgin ground — the site sat on irrigation ditches Native American farmers had dug long before Bass arrived, next to cliff dwellings and granaries. Household implements and mining tools from the Bass era are still scattered roughly a mile north of the river today, according to the Grand Canyon Historical Society’s site history.

The cable crossing

Getting between the two halves of a rim-to-rim trail meant getting across the Colorado, and Bass’s answer was a cable tramway. The north terminus sat on a schist ledge nearly 60 vertical feet above the river; the landing area — stacked stones, cable strands cemented directly into the rock, and other ruins — marks where Bass used to bring his ferry in on a broad sandy beach. It wasn’t a rumor or a later embellishment: a U.S. Geological Survey photograph titled “Cable crossing, looking down the Colorado River, Grand Canyon National Park, Arizona,” shot in 1908 by USGS geologist Levi Fatzinger Noble, was published as Plate XIII-A in USGS Bulletin 549 in 1914 — independent federal documentation that the crossing existed and was standing well enough to photograph by 1908.

The crossing didn’t last as a working structure. Bass sold his canyon holdings in 1926 to the Santa Fe Land and Improvement Company, died in 1933, and what remained of his property passed to the Fred Harvey Company in 1935 for $25,000. The National Park Service is recorded as having dismantled the cable structure itself in 1937 — by which point Bass’s operation had already been out of his hands for over a decade.

What’s actually off-limits (and why)

There’s no fenced closure at Shinumo Creek the way there is at, say, Orphan Mine or the Hopi Salt Mines. The compendium’s only rule is the 100-yard no-camping setback at the confluence — a resource-protection measure for the beach and streambank, not a public-safety fence around a hazard. The Bass camp ruins and cable-crossing remnants aren’t separately named in the current compendium’s closure list, though they sit within a park that generally protects historic and archaeological sites under the same 36 CFR § 1.5 authority documented across this project (see What Is Actually Off-Limits at the Grand Canyon, and Why?). Nothing in the record fetched for this page claims coordinates, a marked trail, or public access instructions to the ruins themselves, and none are given here.

What’s left at Shinumo Creek today is a quiet setback rule protecting a beach that used to be a small farm, a river crossing, and — for about a decade — the busiest hinge point in the only rim-to-rim trail the Grand Canyon had.

Sources

1. Grand Canyon National Park Superintendent's Compendium, effective June 16, 2026 — National Park Service
2. North Bass Trail — Nature, Culture and History at the Grand Canyon (Grand Canyon Historical Society)
3. Cable crossing, looking down the Colorado River, Grand Canyon National Park, Arizona (1908) — U.S. Geological Survey ScienceBase Catalog, Noble Collection
4. William Wallace Bass — "Sublimity & Spectacle," Cline Library Special Collections, Northern Arizona University