Mauna Loa erupting

[ironyak]

When was the last time Saddle Rd had to be diverted and rebuilt?  (Just curious...)

The 1935-6 flow, which this flow is closely mirroring, was the most recent flow that impacted Saddle Road and hit right around Pu'u Huluhulu and down to the east. This USGS article has a succinct history of the flows near Saddle including this fun tidbit answering the ongoing question of why Saddle is located directly on areas known to be prone for lava inundation.

https://www.usgs.gov/news/volcano-watch-...ic-geology
"Past Milepost 22, road builders deliberately constructed Highway 200 atop the 1935–1936 ‘a‘ā flow. That's because rubbly ‘a‘ā is much easier than solid pāhoehoe to grade."