Pimmit Run - 1. Old Dominion Drive to above Glebe Road


Pimmit Run, Virginia, US

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1. Old Dominion Drive to above Glebe Road

Usual Difficulty II-III (for normal flows)
Length 4 Miles
Avg. Gradient 45 fpm
Max Gradient 125 fpm

Gauge Information

Name Range Difficulty Updated Level
FOURMILE RUN AT ALEXANDRIA, VA
usgs-01652500 200 - 5000 cfs II-III 00h22m 11.7 cfs (too low)


River Description

The trip starts off with just intermittent class II- rapids for the first third of a mile, but the gradient then increasess to 80 feet/mile, and there are several class III- rapids over the next third of a mile, as the creek twists through Pimmit Bend Park. It next flattens out for about a mile and a half of mainly riffles, until the gradient picks up again to 60 ft/mile a quarter mile before Ranleigh Road. Scout the dangerous passage under Ranleigh Road beforehand. The creek divides into 5 culverts; some may be blocked and others may be too high or too low (depending on the water level). Just below comes Kirby Road, where there is adequate clearance, and then enters the largest tributary, Little Pimmit Run. The gradient eases up again a quarter mile below Kirby Road, as the creek swings alongside the George Washington Memorial Parkway.
But then, a half mile later, as the creek passes a stone wall beneath a small playground on the right (reachable from Richmond St., off Glebe Road), it begins its final mile-long plunge to the Potomac. The gradient increases first to 100 feet/mile, passing beneath the Parkway, and then to 125 feet/mile in the final approach to Chain Bridge/Glebe Road, in a continuous class III rapid with only micro eddies. Scout this section beforehand from the bridge. In lieu of proper eddies, the usual technique is to run aground on the rocks on river right and carry out to the parking area.
For an urban stream, Pimmit Run is rather pretty and clean, and the water, while a deep muddy brown whenever there is enough of it, has only the faintest whiff of sewage, and has the best water quality of any stream in Arlington County. No doubt, its location in the upscale community of McLean is of great help, as is the fact that it flows mostly through parkland (Pimmit Bend, Potomac Hills and Fort Marcy Parks), and only a few houses will be visible from your boat. There are plans to extend the hiking trail to go all the way along the creek. Other than the speed with which the water level drops, its main drawback is strainers. We encountered about 10 that required exiting our boats, but fortunately none were dangerous or required difficult portages.

A few expert paddlers have run the short and dangerous class 5.1 plunge to the Potomac River, which should be scouted carefully on both river right and river left. There is a low-water bridge under Glebe Road (the remains of a gristmill), and most of the flow goes into a 4-foot wide culvert on river left, that is often blocked by tree trunks. Then the creek turns left, and drops some 25 feet over a series of irregular 3-10 foot ledges, with lots of serious dangers. The higher the Potomac is, the more of this rapid that is covered.

Ed Evangelidi testifies:<br>
Be sure to be out of the water well above Glebe Road, as the man-made hazards below can easily ruin your day. Most of the run is scoutable from a marked hiking trail.
StreamTeam Status: Not Verified
Last Updated: 2005-05-10 23:54:18

Editors


Rapid Descriptions

icon of message No rapids entered. If you know names, and locations of the rapids please contact and advise the StreamTeam member for this run.

User Comments

Users can submit comments.
October 13 2005 (4607 days ago)
Pete MoreyDetails
Taber and I found a very nice play hole at the putin, under the Old Dominion bridge. We caught this
after a heavy rainfall (4 inches that day, plus 4 inches the previous day). The area upstream of
the Old Dominion bridge was flooded over the banks. This caused enough of a drop under the bridge
to form a good, deep play hole. The hole was 10 feet wide and two feet deep with a nice river left
shoulder and excellent eddy service.

For reference, the Four Mile Run gage was at 2000 cfs.
December 22 2003 (5268 days ago)
John AldenDetails
Pimmit Run empties into the Potomac River just downstream of Chain Bridge. It has a small watershed
and subsequently runs infrequently. This is a micro stream that tilts downhill at a nice pace
without any significant rapids above the Glebe Road bridge. The riverbed is primarily composed of
small sized boulders with several 1-2' ledges. There were a few strainers in the riverbed, but none
posed a problem other than one that spanned the entire stream that we were able to squeeze under.
We choose to park at the take-out and hike 3/4 of a mile upstream on a river right path (the
Potomac Heritage Trail) and put in under the George Washington Memorial Parkway bridge. For a
longer trip (approximately 2 miles) you can put in at Kirby Road at the confluence of Pimmit Run
and Little Pimmit Run, however, the majority of the gradient is in the final mile. This is a low
volume stream with no gauge. If it looks runnable at the take-out it is good to go. It is important
to note that as with many local creeks, the water is urban runoff and contains the associated
pollutants and odors. However, Pimmit Run appeared to be much cleaner than Difficult Run or Cub Run
which are particularly unpleasant.
<br />

<br />
The first part of the run from the put-in to the Glebe Road bridge is continuous, technical class
II-III. The difficulty would be greater with more water, but most of the rocks would be padded out
or under water opening things up a bit. There are several fun slots and boof rocks through this
stretch. A note of caution, there is a low water bridge (the remains of an old grist mill) with a
large strainer under the Glebe Road bridge that is a mandatory portage. The flow under the bridge
is diverted through one four-foot wide culvert on river left that has a strainer on the upstream
end and a wall two feet out from the outflow that the water rebounds off of on the downstream end.
It is easily carried on river right, but make sure to grab an eddy before being swept into the
strainer. The final plunge from the bridge to the Potomac River is short, but intense. The current
is swift after the bridge and quickly brings you to a large horizon line. This drop should be
scouted on both river right and left while making your portage around the low water bridge. The
creek drops a total of about fifteen feet over a series of irregular 2-10' ledges in the span of
about twenty-five linear feet. The line I choose was to boof a three-foot high broken ledge in the
center of the creek. The landing zone is only about twelve feet long and six feet wide before you
have to immediately boof another three-foot high ledge. This ledge needs to be boofed on the far
left of the five-foot wide slot. The move is quite tricky in that all but the far left side of the
landing zone puts you into a hole that is backed up by a boulder creating a dangerous recirculation
area. Boofing on the far left sets you up to land in a small hole and you then need to immediately
boof a sixty degree, eight-foot high slanting ledge with a rock protruding up in the middle of the
ledge. This slot is only three feet wide, barely big enough for the boat to fit through. The slide
terminates in a two-foot ledge and then you're in the backwater of the Potomac. To complicate
matters, the rocks in this drop are very angular and many are pointed upstream. A flip would
certainly bring about an injury. Call this drop a class IV.
<br />

<br />
The day we ran Pimmit Run the Potomac was running at 9.5' on the Little Falls gauge. I went back to
Pimmit Run on a day when the Potomac was at a more reasonable level and was surprised to see that I
had only run a little more than half of the final rapid. The remaining half of the drop had been
inundated under water on the day we were there. There was an additional ten vertical feet of rapid
that is complicated by piton rocks and boulder sieves. From the base of this drop the creek
continues at it's steady pace for the final hundred yards to the confluence with the Potomac.
<br />
This is a fun run. We ran it at what I would call the absolute minimum level and it was scrappy the
whole way down. Everyone broached at least once on annoying little subsurface rocks. The creek
doesn't hold water well and the volume dropped by approximately a third from the time it was
scouted until we put on (2 hours). Nonetheless, it was well worth the effort.

John_E_Sunshine


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