Oh no! But hey, that's funny. I find that my heavier breeds -Orpingtons, Marans can not fly their big butts over my 4 foot fencing. The Easter Eggers and Sex links however.... Maybe you need to fatten yours up? Or switch to heavier breeds 

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Snow won't be an issue, we are on the coast of NC.
Although they can still jump the fence even after I've clipped both their wings.
Sorry for the last response.Bridge is clever....do they use it, is there room for 'two way traffic'??
Could be because the bridge is higher than the roost, they like the highest place to roost...or they may have trouble seeing when it is dusk.
I'd raise the roost in the coop, it should be higher than the nests anyway.