We are planning to ride this trail on Saturday morning. Here is a review of the trail from a female ride off of MTBR.com

Summary:
I don't think a girl has reviewed this trail yet, so here's a review that will hopefully help a fair proportion of female MTB riders out there:

BOTTOMLINE: RIDE THIS! IT IS HEAPS OF FUN! The initial uphill sections sure are hard work (marked by black diamonds on the map), but you forget about all of this once you're up on the ridge/Andesite Peak and see the amazing view. The sweet, sweet singletrack in the second half of the loop will undo much of the early pain. Just bring lots of water and food. And be confident riding over loose rocks - pedal evenly and breathe.

I am not an advanced rider and I ride within my limits. I am reasonably fit though and I rode all of this except ~3% which was just too steep or rocky. I saw other guys walking when I was, so it's not unexpected to lift your bike over some parts. That said, you probably don't want to try this as a beginner.

The temperature range on the day I rode this (29 Aug) was ~78-86F (25-30C). It felt warm but not hot as you're riding in the forest. But having come from an Australian winter into a Tahoe summer, I carried some extra water. I carried two bladders in my Camelbak, one 3L and one 1L just in case. I could have got by with just the 3L because I only had a few sips from the second one before the trail ended. So for 2 hr 20 min of riding time for the loop (including the initial road/gravel road ride from Soda Springs/Boreal to the trailhead) I drank ~3.1 L of water (nearly 1 gallon). Hope this helps you plan for your hydration needs.

After all the initial climbing, the trail (all singletrack) twists in a nice flowing manner. The surface varies from smooth dirt in the forest, loose gravel/stone, and hard, flat boulders that are grippy and good to ride over.

There is a series of large steps in the last 1.5 miles. Just be careful if you can't ride down staircases! Also, the last 3 miles involves a bit of navigation if you aren't familiar with the trail. Follow the Adventure Maps Inc map to not miss any of the singletrack that leads away from the fireroads.

Other recommended trails in the same area:
Tahoe Meadows to Spooner Lake (take a shuttle bus back to Incline Village or ask your driver nicely to drive you back up to Tahoe Meadows) - a good way to see the area. Tahoe Meadows to Tunnel Creek Road is fun. The Flume trail itself to Spooner lake is easy (and boring if it's overcast and you can't see the lake), but pick a clear day and ride this section to be wow-ed by the lofty views of Lake Tahoe.

Flume Trail bikes at Spooner Lake is a great shop to visit. They run the shuttle bus service in the area. The number for the bus service is on the Adventure Maps map.

Thank you!

S~