Could not find any unsupported attempt at this. It's possible that Russ Iverson has done it but can't find any written source that.
The RRR is a perfect supported route since a vehicle can drive along the runner. That and lack of water along the route makes unsupported effort rather stupid.
The only water source I could find on topo map was at Rainbow Gulch, a half mile away from RRR at mile 38.5. None of the other creeks on the map looked reliable or next to the road.
Packed 4.5 liters of water to last the 39 miles. Water alone is 10 lbs. With food, emergency gear, clothing, the pack comes out at 17 lbs.
My wife dropped me off at 5 AM and we found a telephone booth there that still works. Takes two quarters though. Who has two quarters with them these days?
The first 8 miles had tons of campsites. There were surprising amount of vehicle traffic that early but a lot were driven by young people slowly. Maybe they're learning?
Things got quite after the split at Devil's Head. Just after mile 20, saw a creek flowing on the left side. Must be from all the rain in the past week. Decided to top off the water here and hence not have to detour to Rainbow Gulch. The price is the pack got heavy again!
The road remained quiet until Mt. Hermon road junction. After that, the Woodland Park traffic came out in force, with tons of shooting for a few miles. Can even tell the magazine size by the shooting intervals. People also drove super fast through the washboards and the side of the road had tons of hubcaps and other stuff that fell off. It also felt hot even though it was only 65 degrees. Between the heat, traffic and shooting, mile 28 to 40 kind of sucked.
Traffic died down after the Rampart Reservoir entrance.
Tried to pick up the pace on the final 11.2 miles of downhill, but the legs did not want to cooperate and can only manage 10:30 pace.
Finished with just under half liters of liquid remaining.
Overall consumed 3.5 liters of water, 3 liters of Tailwind, three roast beef sandwiches, 4 Lara bars, and 3 Cliff bars.