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It is tough to answer this question without a diagram of the bridge. It sounds like a good alternative to this problem would be to create a split with three separate river reaches so that HEC-RAS can calculate a separate water surface profile through each opening. You can see an example of this in the Hydraulic Reference Manual on page 7-7 and 7-8.
Another option may be to use the Multiple Opening analysis contained within the Bridge/Culvert Editor screen. Or you may want to set up separate plans to run both of these options and compare your results. I hope that helps you out.
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