An unusual slot canyon in tilted limestone beds at a narrows on Pahranagat Wash, a normally dry tributary to the Colorado River system. It’s blocked at the upstream end by Arrow Canyon Dam, a flood-control structure built in the 1930s by the Civilian Conservation Corps.

Bypassing the dam requires either a technical climb or a lengthy detour, so it’s most straightforward to do an out-and-back from the downstream end. Sources vary, but it’s roughly three miles from the official trailhead (marked by signs and cable barriers across the canyon) to the dam. Because the canyon is cutting through various rock layers, its character—particularly its width—changes quite a bit depending on the rock unit.

The spectacular “lower narrows” is cut into a massive limestone that in places supports cliffs about 200 feet tall, while the canyon here can be barely 20 feet wide. A prominent side canyon comes in from the left past the narrows; a side trip up it exits into the open desert in a few hundred yards or so. Back in the main canyon, as you continue upstream into the “upper narrows” the soil underfoot becomes much finer, basically dry mud, and it supports a much more luxuriant vegetation cover.

Even though Arrow Canyon Dam should block flash floods coming directly down Pahranagat Wash, it is still prudent to stay out if there are thunderstorms anywhere in the area. There are several large side canyons, like the one mentioned above, coming in below the dam that have clearly carried floods in the recent past.