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The following photos were shot by Tom Page on 19 June 2018:
This former gap-filler radar annex was located atop Black Butte, right next to the fire-lookout tower. The road to the top is gated during winter months. The forest ranger at the NFS office in the town of Eureka (where I stopped to ask directions) said the gate should be unlocked since it was after 1 June. When we arrived, we discovered the gate was still locked. So, we had to go the last mile on foot. The road was fairly steep, and the mosquitoes were bad, but the view at the top was worth it.
The gap-filler radar building foundations (looking northeast)
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Source: http://www.summitpost.org/black-butte/787634
Image reproduced for historical purposes only
Source: http://www.summitpost.org/black-butte/787634
Image reproduced for historical purposes only
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The second image is a close-up of the first, showing what remains of the gap-filler radar tower footings / foundations
Source: https://www.flickr.com/photos/montanatom1950/14816719690
Images reproduced for historical purposes only