Yep, it's slippery.  I can attest to that.  Slid out tonight while crossing it.  I never touched the brakes.  But that wasn't the stupid part.  I got back on my bike and then slid down again in just 10 more feet.  I've done a lot of ice skating in my time, but have never seen anything more slippery than that bridge tonight.  Most of 'em are probably pretty slippery now with all the rain we've had.

I recommend walking your bike across.