Located in the Bering Land Bridge National Preserve, it is a 38-mile (61 km) ditch dug in 1906-07 without the benefit of heavy equipment in extremely hostile terrain.

The water is diverted from Wade Creek into Pinnell River by the middle section of the ditch, which is about half a mile long.

The lower section of the ditch extends from the intake on Pinnell River along the right side of the valley to a point a few hundred feet below Logan Gulch, a small tributary of the Inmachuk above Arizona Creek, and has a length of about 19 miles, making the total length of the ditch 36.5 miles.

Above and below Snow Gulch, the lowest tributary of Pinnell River which the ditch crosses, are short pieces of rockwork.

Much difficulty was experienced in making the rockwork water tight on account of the lack of good sod, as the surface covering is commonly decayed moss or peat containing much fibrous matter and little earthly material, and will float even though saturated with water, so that it is necessary to weight it down with rocks when it is used on the bottom of the ditch.

The construction was completed in July, 1907, and water was run through the ditch for a short time in September of the same year.