"Bob Noble" wrote in message
...
It looks more to me like that is a bridge used to support a big pump for
some kind of irrigation. Note the pump in the middle with the overhead to
rise the pump.


I suspect that the "bridge" served to hold a "hydralic ram" which uses the
velocity of the water to pump a small portion of the water to the level of
the surrounding fields.

OR, it could just be a structure to hold a water turbine is the center of
the stream.

The structure in the middle tooks like something used to pull something
normall in the stream bed to the level of the bridge floor for maintenance.