Road ecology blog: water eroding away wildlife path at multifunctional underpass, Montana, USA.
This is a multifunctional underpass for a stream and wildlife, US Hwy 93 South, Bass Creek south, south of Florence, Montana, USA. Water has eroded the soil and rocks under a concrete walkway designed for wildlife. The design allowed for a relatively short length of the bridge, but it also resulted in steep slopes and a narrow strip for wildlife that was made into a "sidewalk". However, the stream dynamics are such that this design is not without its problems (see image). To reduce maintenance it is probably better to have a slightly longer bridge, more gradual slopes and a wider zone for both the stream and wildlife that is more robust and that does not require concrete or other unnatural elements.
Click here for images of other multifunctional underpasses.
Click here for more images of wildlife underpasses.
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