The Waterworks is the river that will have many of the Olympic stadia and buildings aside from the main stadium

The Waterworks River has recently been the least accessible of all the Bow Back Rivers. There used to be a walkway along the western side but it was shut due to safety fears for the rail sidings at Thornton Fields. The only part of the Waterworks River than can be walked is the short bit between City Mill lock and the Northern Outfall aqueduct(and this ironically is one of the few remaining routes still open to the public since the wholesale closure of most of the Bow Back rivers network for the London Olympics construction!)
I remember way back in the 1960's the narrow gauge railway that served the Kendon site mills between the Pudding Mill and Waterworks River. The railway rain round three sidesof the site as faras I remember and rolling stock and the little green (Hunslet?) locomotives were always stabled adjacent to the Great Eastern main lines. Whilst doing the photography for the Waterworks River, I discovered narrow gauge rails on the bed of the Waterworks River so I guess this is where the track ended up when the narrow gauge railway was no longer needed.
One often wonders about the available height under the Northern Outfall aqueduct. At high tide there's certainly very little headroom. The water level will have to be maintained well below its maximum level if the waterborne Olympics construction traffic is to be realised. There's a major problem for river passenger vessels. These will not be able to use the Waterworks River because they are too high. Specialist passenger vessels (like the one operating in Docklands) or narrowboats would be neccessary.
The Aquatic centre will be sited along the Waterworks River to the north of Stratford, in the area bounded by Stratford International station and the Great Eastern main lines.

A view of the Waterworks River from a passing train. On the right is the Aquatics centre site and on the left are the sidings at Thornton Fields
The start of the Waterworks River at the junction with the City Mill and Three Mills Wall Rivers. The bridge carries the A11 road and the skyline is Canary Wharf
Information Board for the Waterworks River seen in 2003. Its now vandalised and possibly beyond saving

Left: View from Northern Outfall looking to the entrance to City Mill River. December 2005. Right: The Waterworks River adjacent to the A11 trunk road in April 2008. Demolition has taken place and new flats are cropping up

Left: Someone's 'allotment' next to the Northern Outfall aqueduct! Now fenced off and inaccessible. Right: The concrete structure over the Waterworks River at Bridgewater Road. Between here and the Great Eastern rail bridge there are lots of complete narrow gauge track panels dumped on the river bed, presumably from the Kendon factory site where a narrow gauge railway served until the late 1960's or ealry 1970's
Close up of narrow gauge track on the bed of the river
View looking north from Bridgewater Road to the Great Eastern/Docklands rail bridges
The Waterworks River from a Docklands Train, taken December 2005. In the larger sized original photo yet more narrow gauge tracks can be seen on the river bed! The Bridgewater Road crossing is in the middle distance

Left: The Waterworks River south of Marshgate Lane bridge in 2005. Right: The river in 2003 showing Marshgate Lane bridge and the now demolished factories
View of the junction with the Old Lea. From this point northwards is the River Lea
River Lea looking north towards the North London line and the Channel Tunnel Rail Link bridge