What is this bridge structure over the Rouge River?

[416]

I went for a walk in Rouge Park and saw this structure over the Rouge River.

I wanted to ask if anyone knows what it is.

Was this something larger that had been partially dismantled? Or did this serve a purpose exactly the way it looks?

Google maps link: https://goo.gl/maps/7g4Sq

I want to note that nearby is the abandoned track of the former Toronto Zoo monorail (shutdown a while back after getting into more than one accident). I don't feel like this bridge is related to the monorail but who knows. Just thought I'd throw that out there.

Link to album if you can't see attachments: http://imgur.com/uVM5NXV,rhxN3Sc,J4bnEuS

 

[EVCco]

http://urbantoronto.ca/forum/showthread.php/18648-Anybody-know-what-this-is

likely some utility span, was the previous consensus

 

[W. K. Lis]

Working migrants from Pickering using the crossing to get to a TTC stop, under the cover of darkness?:^)

 

[donoreo]

http://urbantoronto.ca/forum/showthread.php/18648-Anybody-know-what-this-is

likely some utility span, was the previous consensus

I have seen these elsewhere, usually with pipes/conduits running across them.