Not near as immense a project but similar. We(TxDOT) had to install toad channeling devices to channel the endangered Houston Toad to culvert pipes along State Highway 21 here in Bastrop county ( lost pines area) so they could make their yearly migration across roadway like the chicken crossing road.
They were a 1/2 cut, length-wise piece of 12" or larger plastic pipe 1/2 buried in the right of way that prevented the toad from jumping out on the pavement.
When I was talking to one of the fellas in the enviro section (thanks Fed gov) if they worked they said "oh hell yeah! Too well!!"
Seems all the snaked and birds that dine on said toad learned to wait at the other end of culvert for a meal!! LOL!!!
The big Labor Day fire here several years ago just about rang the death Nell for that toad! Dunno if they will ever recover. So goes the life of a toad.
(Not many people can say that!)
