And then the next question is whether the new river will be still water (which would be similar to the Rivers of America) or be a running river that would help mask sounds of the Cars attraction? It's questionable if they have enough height difference for running water, say, if it started at the Liberty Square waterfalls and ran to Tiana's. The consistent amount of exposed boardwalk pier-height in the Piston Peak fun map suggests still water (no height delta). Though it's a cartoon map so I'm not putting too much weight in it.
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But I do think the long stretch of level boardwalk makes having much of a height delta and a running river difficult. Instead, sound masking could come from moderately high (say 10 to 20 feet) waterfalls all along the rock berm hiding the attraction, though that's not at all what's shown alongside the Cars path. Something like this, which would be very scenic as you walk through Frontierland would really help satisfy guests who will miss the river. Having some new boardwalks or suspended bridges ducking behind these waterfalls would be amazing.
In fact, it would be fun to go back behind a waterfall near the Country Bears and discover that the bears live back there, maybe we see the (projection) silhouette of one of the bears singing in the (waterfall) shower.
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