Diameter was measured several times at several heights for several purposes. The girth points are from dbh diameter known as diameter at breast height. There is about 11 feet difference between high side and low side. The difference was averaged between high and low sides in the strictest sense for where trunk meets earth. The nationally recognized formula for points adds height + girth + 1/4 crown. I used Chris Atkins' height measurement. Average diameter at dbh is 27.38 ft.. Age estimate 2750 years. When measuring, I did not include any trunk under the soil surface. Only what's beneath fallen twigs, wood, leaves and loose needles.
I dropped the menu rank for Grogan's Fault to 2nd largest and formed a new page The Emissary to represent the #1 arena for any other coast redwoods not yet published, or not yet discovered.
September 2016 was a dry summer with virtually no rain June - September. It was a surprise to approach early autumn and feel boots sink ankle-deep into saturated earth - the spring was revealed. That partly answered how this redwood and a few more in Olympian Grove may attain their size. This is similar to spots near Orion and Episkopos. The presence of hidden spring water tends to debunk a super-DNA hypothesis that some people hold regarding the largest. I teach that largest coast redwoods happened to be in better conditions and happened to endure when nature threw catastrophes at them.
"Spartan" was the first name for this redwood. At some point, we were talking about nearby geological features in Redwood National Park including Grogan Fault that divides opposite sides of the river. That's how the second name evolved. Spartan reflects the redwood's ability to stand it's ground for so long. If others choose Grogan's Fault that's fine, but I will be using "Spartan" more. Several names were considered. Other redwoods have two names too, like Melkor which is Fusion Giant, Cal-Barrel Tree which is Iluvatar, or Dry Heaves Tree which is Maia.
The first name stems from the Spartans and King Leonidas at the Battle of Thermopylae, in 480 BC.. They were greatly outnumbered but fought one most epic battles ever. A famous example of endurance and standing one's ground.
Grogan's Fault was the only name we published between May, 2014 and April, 2017. In 2017 when when I learned Hildebrant's age estimate, it convinced me to use the original name Spartan again.
In April, 2017, I got the complete copy for volume measurement with diameters for every 10 ft. inccrement of height. The data starts at "0" (zero) elevation with 24.9 ft. as the diameter. That should be diameter about 1 ft. higher than where the trunk enters earth on the upslope side.
That means our math Guru's 38,299 cu. ft. is minus the rest of the trunk reaching 11 ft. lower elevation on the downslope side. He is known to be conservative.
Using a conical frustum calculator, then dividing by half, the huge extra wedge of trunk may add 3,025 cu. ft.. Combined with 38,299, total volume of the main trunk without reiterations should be about 41,324 cu. ft.
Spartan's main stem alone appears to be as big as Lost Monarch's bole, extra 6,000 cu. ft. redwood trunk next to it, plus all reiterations combined. Spartan may never be climbed, and it's full volume with reiterations could remain a mystery for a long time. Either way "it is what it is" says Thomas from Germany, a silent partner who helped me explore this grove.
At a height of 60 ft. the trunk averages almost 17 feet diameter. At 240 ft., the trunk is still 8 feet thick. The crown spread spans approximately 110 ft. wide and is more complex than I first realized. The age estimate is upward of 3,000 yrs.. Ron Hildebrant estimated 2700 to 3000 yrs. Given what I've seen in photos and documents of other coast redwoods in relation to diameters, usually much smaller, I will go out on a limb and estimate 2800 to 3400 years.. There is hardly any damage along most of the trunk like goosepens or other large wounds. The crown has typical gnarl and sculpting from countless storms, but looks solid. Among all the coast redwood titans, if any could push for 4,000 yrs., this is the one I'd put money on. Time will tell, but I won't be around.
Image: Spartan's thick canopy is like a forest within the forest, holding up a myriad of limbs and trunks like this one facing the southwest. I'm considering re-purchasing one of the point-and-shoot mega zooms like I used to drag around years ago helping Atkins measure LiDAR redwoods. It would be like sticking a 1200mm ens on my full frame Canon, but under $300 dollars. For plain documentary keepsakes, it would be worth it to capture more details inside the upper structure.