The official name is "Bell" Canyon.  All the signs, city website documentation, etc. list it as "Bell" not "Bells"   

Here is a link to a Google Street View of the "Bell" Canyon Preservation Trailhead Sign:  https://www.google.com/maps/@40.5719508,-111.8000785,3a,15y,127.34h,83.97t/data=!3m6!1e1!3m4!1sb18hO2NC3BObnLZ0zsQ2dA!2e0!7i16384!8i8192?entry=ttu
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            Published using OSMCha: https://osmcha.org/changesets/136751827
            