MOO
Being new to these threads, I took a lot of the numbers about temperature and where they would be on the trail that were mentioned in various places at face value. I just assumed they were accurate.
But since I have absolutely no life, I found time to run through all that data. And if they did a straight hike as many believe,
I don’t see how any of them would have encountered temperatures over 100 degrees on that trail, let alone 106 or 109.
To judge times on the trail, I used the standard Naismith’s Rule for hikers, hill walkers, etc., which is 1hr for every 3mi, plus an additional hour for every 2000ft of climb.
The route from the trailhead on Hite Cove Road begins at 3900ft elevation and drops down to the river at Nutmeg Gulch (1800ft) covering 2.5 miles. (Source:
https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5344035.pdf )
The level route on South Fork Trail from Nutmeg Gulch along the river to the base of Savage-Lundy Trail is 3.1 miles. (Source:
Hiking on the Savage Lundy Trail | Sierra News Online )
The hike from the signpost on the South Fork trail up Savage-Lundy Trail is 3.0 miles and an ascent of approx. 2100ft. (Source:
https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5344038.pdf )
The relevant temperatures on 8/15/21 at the Jerseydale weather station (elev. 3900ft) were:
8am: 82F
9am: 84F
10am: 89F
11am: 91F
Noon: 94F
1pm: 95F
Source -
Jerseydale California
The relevant temperatures that day at the El Portal weather station (elev. 2050ft) were:
8am: 85F
9am: 92F
10am: 99F
11am: 103F
Noon: 107F
Source -
El Portal California
They’re seen approaching the trailhead at 7:45 that morning. If they start the hike at 8am, it would be 82F where they are at the top. They would be down at Nutmeg Gulch on the river by 8:50am before the temperature got to be 92F. Then they would cover the level 3.1 mile trail along the river in an hour. But I’ll be conservative and add in 10 minutes for water breaks and maybe a diaper change.
So by 10am, and they would conservatively be at the base of Savage-Lundy Trail, ready to head up back to the truck. The temperature would be 99F.
Up to that point, they have only hiked for 2 hours, with breaks, on downhill or level terrain. The temperature over that time has spanned from 82F to 99F. And they’ve had immediate access to the river if anyone wanted to quickly dunk in or wet their clothes.
So far, that’s a mild to moderate hike on a hot California day with a cool river nearby.
According to Naismith’s Rule, it should take them 2 hours to hike up the 3 miles of switchbacks (3 miles plus 2000ft ascent). But it’s hot and sunny, so I’ll be extra conservative again and tack on an extra hour just for very frequent stops to rest and hydrate and snack. That is a generous 3 hours to hike 3 miles.
They would be halfway up, at elevation 2900, at 11:30am. The temperature at the top of the trail (3900ft) would be 92-93F at 11:30. The temperature at the bottom where the started the climb would be 105F at 11:30. The temperature in the middle would again be around 99F. And that’s presuming a very leisurely stroll of 1 hour of hiking intermixed with an additional 30 minutes of nothing but stopping, resting and hydrating along the switchbacks.
The last 1.5 miles would take another conservative 1.5 hours with stopping and hydrating along the way, arriving at the top by 1pm.
The temperature at the top at 1pm was only 95F. So during the last 1.5 miles of hiking to the very top, they would have been experiencing cooling temperatures as they went.
What am I missing? How did we all think they would have been on the trail down below during the times it was over 100F?
MOO