That would make this a somewhat WEIRd request, I suppose?
(You know the punsters are hard at work on this one, Tom!)
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I'm assuming your working to blend with existing photographic backdrops to either side?
Any chance of providing a photo of the setting on your layout?
Since whopper weirs are not usually found in an urban setting, I should think it should be a relatively easy job of blending natural 'shore' scenes and more distant scenery to the center (across the reservoir).
If there's no existing backdrops to either side, perhaps an opportunity for a local artist, especially skilled in scenic vistas?
KD