Sentinel Falls is what I'd consider one of those second-tier seasonal waterfalls in Yosemite that is more substantial than the ephemeral waterfalls like Horsetail Falls but not in the class of Cascade Falls. I'd say it's a little bit below Ribbon Falls in terms of waterflow.
Anyways, I suspect this waterfall got its name from its proximity to the giant monolith towering over it, which is known as Sentinel Rock. The falls is said to have over 2000ft in cumulative height as it drops over multiple steps on its way from the source by Pothole Meadows (near the Glacier Point Road) to the valley below.
Speaking of the source, the waterfall is best seen during the peak snowmelt period, which typically happens in the late Spring. However, over the years, we've seen how snow pack levels affect both the timing and the vigor of the falls so it's conceivable that peak flow could happen as early as late March or as late as early June. We've also been here too early when the falls was still frozen in Winter (or merely trickling as the thaw wasn't extensive yet) as well as too late in Summer when the falls was pretty much dry. If I had to guess when the best time to see the falls would be given the fluctuations in snow pack levels, I'd reckon the statistics would favor May as the time to see it flow reliably.
Looking across Yosemite Valley towards Sentinel Rock and Sentinel Falls from trail to the top of Yosemite Falls
The Pohono Loop Trail went around Sentinel Dome, but we were fortunate to see this Jeffrey Pine Tree before it fell over a couple of years later from the summit of the dome
The Pohono Loop Trail also branched off towards Taft Point, where there were stomach-butterfly-inducing views of Yosemite Valley
Looking up at both Sentinel Rock and its neighboring falls from the Four-Mile Trailhead (signpost V18 on the Southside Drive). This photo was taken in late May 2002.
This photo of Sentinel Rock and Falls was taken in early May 2003. Notice the lower waterflow as we apparently showed up before the peak snowmelt at this time.
We spotted this repeater or tower or something by the Pohono Trail between the Sentinel Dome and Taft Point Trails
Vertigo-inducing look down at Sentinel Falls from the Pohono Loop Trail between Sentinel Dome and Taft Point. It's so precipitous here that it's hard to tell what's up and what's down in this photograph!
This photo of Sentinel Rock and Falls from the Upper Yosemite Falls Trail
Almost direct view of the falls from near Leidig Meadow
This was a more recent look at Sentinel Falls from the Four Mile Trailhead in June 2011
Since this waterfall sits in Yosemite Valley, there are many ways to experience it. We'll briefly break down how we've been able to experience Sentinel Falls. For a little context, we generally arrive at the valley from Los Angeles by taking the I-5 north then the Hwy 99 north to Fresno. From there, we take the Hwy 41 north through Coarsegold, Oakhurst, Fish Camp, etc. through the South Entrance of Yosemite and ultimately to the valley via Wawona. This drive would typically take us around 6 hours (without traffic).
The most obvious place to view this waterfall was at the trailhead for the Four-Mile Trail at signpost V18 along the Southside Drive. From the pullout here, the area was open enough to be able to see the falls along with Sentinel Rock without too many trees getting in the way.
For a different and much quieter view of the waterfall, we went to Leidig Meadow, which was accessed from the Northside Drive west of Yosemite Lodge. We managed to spot a trail that went into the wooded meadow with sporadic opportunities to get more direct views of Sentinel Falls that most people probably overlook since this trail didn't seem to be very well-used. As a matter of fact, we weren't able to spot any formal car parks or pullouts near this meadow, which probably explained why it was so quiet here. I actually had to find an informal pullout beside Northside Drive as I went west of Camp 4. Then, I had to walk along the road until I found a trail I could take into the meadow itself.
For a more elevated perspective of Sentinel Falls, that came from the trail to Upper Yosemite Falls, which began near signpost V5 just by Camp 4 on the Northside Drive. I started to get views across the valley in about a mile into the hike.
Finally, I managed to experience this waterfall near its brink along the Pohono Trail. The issue with seeing the falls this way was that I had to crawl on my belly and peer over the cliff's edge down at the cascading waterfall. Needless to say, this induced intense butterflies in my stomach as there wasn't much real estate between my body and gravity threatening to plunge me over a thousand feet below! To get here, I started on the Sentinel Dome and Taft Point trail at signpost G8 on Glacier Point Road, then I found my way to the Pohono Trail, which links both the Taft Point Trail and Sentinel Dome Trail on the other side of Sentinel Dome. This trail crosses Sentinel Creek, and that was where I found a detour that took me right to the cliff's edge near the brink of the falls. It's definitely NOT for those with acrophobia.
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