Inside the Levee
Spaced all along the Trinity River in Fort Worth are interesting little channels through the sides of the levees.  These allow water to be dumped into (and presumably out of) the river.  The flow of water can be turned on or off by opening or closing a door via a mechanism at the very top of the levee.
That's Dani and her dog Gus (at the end of a long leash) way off in the distance.  She is standing above the shaft with the river on the far side behind her. 
A close-up of the entrance.  The last time I was here, there was a lot less water (i.e., it was almost dry; there was only about an inch in there this time).
An inside view.  It's not a terribly pleasant walk, crouching the 100 ft. or so until you get to...
...here.  This is in the deepest part (highest point) of the levee.  If you look straight up you will see...
... this!  The ladder goes up about 35 ft. or so to a grate, which was locked the last time I was here.  I didn't bother trying it again this time.  At any rate, as you will see in pictures below, the top is surrounded by a locked fence, so it wasn't worth it.

On the left of the frame is the shaft that leads down to...
... this huge door.  This is what stops the flow.
I continued straight forward from here I left off at the ladder.  This door opens into the river, and it apparently opened by the force of the water as there is no visible control mechanism.
Here's the other side of the levee.  Behind/to the left of Dani is the top of the shaft with the controls for the gate just behind the gate.
And here's the grate at the top of the shaft.  I thought it would have made for a great shot to have me trying to climb out of here, but the batteries in Dani's camera turned out to have died, so this is the best I could do without either handing her my camera and trekking back in or running back to the car for the spare batteries just for the one shot.  Sorry, I'm no Spielberg!
Finally, this is where the shaft dumps into the river.

Distance = 0.029 miles (151 feet)
 
And here is an aerial photograph from GlobExplorer (duh!).
Update:  I went back one night about a week after the photographed expedition (if you could call it that) to get the GPS coordinates.  It happened to be really windy, and the breeze was perfectly aligned with the tunnel.  Since the vertical shaft is perpendicular to the channel I walked (crouched) though, it basically forms a giant, inverted flute where the wind is cut across the huge hole at the bottom of the shaft.  And because the wind speed constantly changes, the result is a series of natural harmonics around the resonant frequency.  It's very musical!  Or if you happen to be out there at night, it's actually a little scary!
Alexplored 1/10/04.
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