The Colter Ranch Historic District consists of twelve buildings in a rural setting near Eagar, Arizona.

[2]: 5 The boundaries of the historic district are the Little Colorado River to the north, 4th Street to the south, and School Bus Road to the west.

[2]: 23  The Milligan Ditch, bringing irrigation water from the Little Colorado to the historic ranch bisects the district, running east to west.

These include three sheds (two wooden, and one corrugated metal); a stuccoed log bunkhouse; a log cabin; a corrugated metal shed; a larger wood storage building, which at one point served as the ranch's commissary; and a wooden machine shop.

[2]: 7  It is a ten by fifteen foot rectangle, the exterior of the building is covered with finished planks, fitted at the corners.

Two stories tall, the walls are covered with board-and-batt siding, and has a corrugated metal roof of medium pitch.

The entire barn complex is enclosed by a corral, which has a split rail fence approximately 5 feet high.

The wooden shed is about ten by fifteen feet, with a gable roof of medium pitch, sheathed in corrugated metal.

Duge maintained the family home in Amity Valley, running a large portion of her father's original herd of 350 cattle.

When he died at the age of 51, his one-third share of the Amity Valley property was left to Duge, who then controlled two-thirds of the original homestead.

She has successfully run her own cattle operation for over ten years by the time she re-consolidated her father's entire homestead.

He brought an unknown number of his own cattle to the ranch, in addition to taking control of the 1100 head which were in Duge's herd, as well as over 800 he also managed for Elizabeth.

Two years later, he had developed four reservoirs in the area: Colter, Mexican Hay Lake, Pool Corral, and Hog Wallow.

[2]: 15 It was during this timeframe that he built the large barn on the property, to store approximately 40 tons of alfalfa to use as feed for his livestock during the winter.

[2]: 11–12 By the end of the 1910s, the ranch operation had reached its peak, containing over 43,000 acres of deeded land, and leased acreage surpassing 200,000.

In order to stave off creditors, Colter formed the Northern Arizona Land Company, which issued $450,000 in bonds, using all of the deeded acres as collateral.

Thude eventually sold his acreage to Louis Johnson and John Wayne, who added additional territory and created the 26 Bar Hereford Ranch.