The post office began in the Watkins' farm wood shed in the Upper Applegate Valley near the mouth of Squaw Creek, about fifteen miles S of Applegate between Wright and Copper. Mark Watkins carried mail up the Applegate weekly and became the first postmaster. Later, by Model T mail came three times a week. The post office moved from Watkins' ranch across the river to Fawcett's in 1901. The office recrossed the river to Langley Ranch until postmistress Katie Byrne took care of mail at her storage shed on Squaw Creek.

The post office was in a store on the upper reaches of the Rogue River near the mouth of Union Creek on the road to Crater Lake ten miles from the west entrance of the National Park and about twelve miles north of Prospect. The post office and resort took their name from Union Creek which was named for Union Peak in the Park.

Already served by Prospect for half the year, Union Creek's seasonal post office was discontinued April 1945 but it really did not reopen after closing in the fall of 1944.

Named for an Indian path between the Rogue and Umqua Valleys, Trail is on the Rogue at the mouth of Trail Creek, 3 miles N of Shady Cove. The village crossroads post office still serves a large rural area.

All the other post offices in the northeast part of Jackson County ended up disappearing with patrons being served through the post office at Eagle Point except Prospect, Butte Falls, Trail, and Shady Cove.

Where did they go? Following the mail trail of the DPOs of Jackson County, Oregon (SHS 979.5281 S93 2013)

Entrepeneurs moved the Tolo post office away from Willow Springs 3 miles N to the Rogue and SP tracks near the site of old Fort Lane (1853-1871). Although Tolo was revitalized as construction city" by the Ray's rock quarry and dam construction and the post office reopened