June 8, 1939: "Corwin Hein of the Bend forest service office and Lawrence Chapman, Sisters forest ranger, went into the northern part of the Green ridge area recently acquired by the forest service from private owners and the state, and looked for a suitable location for a lookout. A butte known as Five Fingered Sentinal was chosen, as it commands a view of most of the area to the east and north which other lookouts in the forest are unable to cover, and much of the area under the north end of Green ridge which Black butte lookout is unable to see. The butte is southeast of Bald Peter lookout on the Indian reservation. A road will have to be built to the Sentinal and a telephone line erected. Ray Koski will probably be the lookout placed at the new post." (The Bend Bulletin)
July 21, 1939: "A crew of five men under the supervision of Nels Harland of the Bend Forestry office is working on a new road from Prairie farm in the lower Green ridge country to Five Fingered Sentinal, the new fire lookout in that district. The road will probably be completed this summer." (The Bend Bulletin)
August 4, 1939: " Work preliminary to the erection of a new lookout station in the Sisters district, on Green Ridge overlooking the forest service’s recent acquisition of 11,265 acres of timberlands, will be started Monday when a road crew is transferred into the area to begin construction of a three mile spur. This road is to be an extension of the Prairie Farm road. Later, a lookout tower and house will be erected on a dominant point of Green Ridge. This lookout point will be occupied next season." (The Bend Bulletin)
August 18, 1939: "N. Hansen of the Warm Springs forest service staff and a crew of men are on the lower Metolius river this week near the Theodore Hubbard place looking for a suitable telephone crossing to connect the telephone line from the reservation with the forest service line which now reaches as far north as the new lookout on Five Fingered Sentinal. The line from there comes south to Allingham ranger station. Eventually there will be a direct hookup from Sisters to the reservation. Arvo Koski has moved from Prairie Farm where he has been stationed as lookout while waiting for the Five Fingered Sentinal location to be made ready for a lookout, and is now in a temporary 'crows nest' in a tree, there." (The Bend Bulletin)
July 24, 1940: " Charles Lewis, who is lookout at Alder Springs reports that a bolt of lightning struck a green tree about 100 yards northeast of the tower Sunday. Lewis got down from the tower to seek shelter and was only 50 yards from a snag which was struck by a second bolt of lightning, not 15 minutes after the first. The snag was splintered and Lewis says he will not have to worry about firewood for the rest of the summer. The second bolt of lightning struck the same distance, 100 yards, southwest of the tower." (The Bend Bulletin)
October 22, 1941: "A six acre forest fire was discovered and extinguished Thursday, by the forest service employes here. The fire was another hunter fire and was located directly west of the Alder Springs lookout on the northern end of Green ridge, between the rim of the ridge and the Metolius river, and was very hard to get to." (The Bend Bulletin)
1944: A 76-foot treated timber ring connected tower with a 14x14 standard L-4 1936 cab was constructed at a point a couple miles north of the tree lookout. Total cost of this structure was $2,492.09. Source of water, from a stream 10.5 miles south of lookout.
1959: One fire was reported from this station during the 1959 fire season.