See MAP

Water Route - Revised, (12 miles), Not created by Max "I Love Hills" Reid , 7/1/2004
As its name suggests, this route goes along waterfront the whole time (so in case it gets too hot you can just jump in the river). And it’s flat! Enjoy ;-)

From Iwo Jima (mileage is approximated):

0.0 Begin at Iwo Jima. Run through Rosslyn across Key Bridge toward Georgetown.
1.0 Sharp RIGHT after bridge down to river side of C&O Canal. LEFT on C&O Towpath and QUICK RIGHT down steps to K St. LEFT on K St Eastbound toward the Washington Harbor. ZIGZAG RIGHT and LEFT to get onto the path fronting river (heading downstream)
1.8 Pass by left side of Thompson Boat Center and take a RIGHT at the Rock Creek Trail, heading by the Watergate and the Kennedy Center. Sing favorite Sondheim song aloud.
2.6 After running under the Roosevelt Bridge and past the half-circle, but before the hill up to the Lincoln Memorial, take a LEFT across the street and follow the path THROUGH the volleyball courts. While near the volleyball courts, watch out for bouncing objects.
(IF you managed to climb the hill to the Lincoln and the Memorial Bridge, you can EITHER turn around to go back down the hill OR run down the stairs without tripping and cross the busy road on a blind curve. If choosing latter, please be wearing appropriate medical ID and have your insurance up to date.)
4.0 After running under an overpass and under the Memorial Bridge, STAY to the right and follow the path between Ohio Drive roadway and the river (like the finishing of the Cherry Blossom 10 miler). Along Ohio Drive, see if you can spot the “Air Mail Rock.”
5.8 Continue running past 14th Street Bridge and counter clockwise around Haines Point. At Hains Point, see “The Awakening” sculpture by J. Seward Johnson, Jr. Finish the Hains Point loop on the Washington channel side. Admire Fort McNair across the water.
OPT. (LEFT at Buckeye Dr and LEFT at Ohio Dr for another 3+ mile loop of Hains Point)
7.8 Pass under some overpasses to arrive at the Tidal Basin. Turn RIGHT and circle the Tidal Basin counterclockwise. Try to get picture taken by tourists. And NO pushing!
9.2 After passing FDR, turn LEFT on East Basin Drive, cross the street, run ~100 yards and turn HARD RIGHT up the incline to the 14th Street Bridge back to Virginia.
9.7 At end of bridge Turn RIGHT and follow the Mount Vernon Trail along the river to Arlington Cemetery and return back to Iwo Jima via Arlington Cemetery route.
12.0 Drink Gatorade at the Iwo Jima since sick of looking at water by this point.

Known Bubblers (aka Drinking Fountains)

-- DC side of Key Bridge
-- Thompson’s Boathouse
-- By volleyball courts (usually off)
-- Along Ohio Dr by FDR Memorial
-- Bathrooms heading down & back from Hains Point (Little round buildings)
-- Underneath Jefferson Memorial
-- FDR Memorial