Big E provided us with this description of a run of Timpoweap Canyon with Mark and Frank. For your reading pleasure.

We have always called this the Timpoweep Canyon run. I estimate 500 to 750 cfs optimum,
800+ (at Virgin River at Virgin gage) you won't see me there.  Could be done at lower
 flow levels.  We portaged  the Dam on river right, and did use their road. The gate 
was locked, we threw our boats over the fence, did the same with our bodies, 
and were on our way downstream. 

We scrambled down the steep bank and put in on class IV off the bat. We
called this rapid the Boulder Garden. It dumped into the first major drop we
named Crux rapid. It is a boulder sieve with a sharp left, right under a cut drop.
(We scouted every drop at river level).  There were several more rapids up to
the next portage we called Mormon Falls. This was an old pioneer diversion dam
for irrigation down stream. It looked to us, after the portage, as an easy boof,
but we chose not to try that time. The next major rapid,
we named Blue Ball Falls. A blue basket ball stuck in the eddy on river left.
This rapid was a dangerous boulder sieve, with one steep narrow slot on river
right into a deep pool. A for sure scout. More unamed rapids untill the next
major drop, one of the bigger ones, and one we missed on the initial scout. We
named this one the Ledges. Several Big drops back to back, demanding some moves
or else. This rapid among others would have been a bad swim for all but the
lucky. This whole run had many places to pin, broach etc. There were a few more
small rapids until the take out at the hot springs. We had our cars shuttled to
the parking lot there. At the time, the manager of the hot springs was cool with
that. There was an old trail on river right, across from the hot springs, [private land] we
hiked in the morning of the run. It goes up stream about as far as you care to
hike. This is where we failed hike up far enough to scout the last major rapid.
There are also several dirt roads, that turn south off of Hwy 9, that give
access to the rim of the canyon, for scouting from above. But the river looks
a lot different from above. Just the same, a good thing to do. 

Just as a note, that same year we came back to do the run again. After scouting from above, we
realized it was much to high to run. Later we learned they were dumping the dam to
flush out the silt buidup on the bottom. This made the canyon run much to
dangerous for us. Instead we put in at the hot springs, and ran past the Quail
Creek Dam, down to the Hurricane SR-9 bridge. This was a superb run. We
estimated  about 1000 cfs+. Sand wave trains on every straight away, and
seenery, nice!!!

[VRRC note-- Washington County Water Conservancy District has removed the Quial Creek pipeline from the downstream portion of the river bed in Timp Canyon as of October 2002. No information is yet available on changes in the river bed and channel .