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Mobile Crane Load on Concrete Flume/Bridge

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I am Looking for some design Guidance on load for a "bridge".
 
Here is the scenario I have a water distribution canal that intersects a drainage ditch. A concrete flume carries the distribution canal over the drainage ditch. The flume is about 30' wide at spans an 80' drainage ditch. There are two rows of intermediate support columns that break the 80'. The flume and subsequent distribution ditch end up creating an island of land that must be accessed by a crane to facilitate maintenance of the canal.  The idea is to put a top on the flume and drive over it to reach the island.
 
My concern is that the crane (track mounted) will have to approach the flume either at 90 to the flume or some shallower oblique angle. This means that the crane will be turning on top of the bridge/flume. Either end of the flume will be anchored into the bank and the road deck can act as a diaphragm to transfer the twisting motion of the crane. But what is the force exerted by the crane? worst case? Are there any other considerations other than typical load bearing type considerations.
 
Any insight would be helpful. TIA
 
Rand Holtham 
BEGIN:VCARD
VERSION:2.1
N:Rand Holtham;P.E., Sigma Engineers
FN:Rand Holtham, P.E., Sigma Engineers
ORG:Sigma Engineers Inc.
TITLE:Structural Engineer
TEL;WORK;VOICE:409-898-1001
TEL;WORK;FAX:409-898-3420
ADR;WORK:;;;Beaumont;Tx;77706
LABEL;WORK:Beaumont, Tx 77706
EMAIL;PREF;INTERNET:rand(--nospam--at)sigmaengineers.com
REV:20031113T204803Z
END:VCARD