I don’t know the actual grade, but the stretch of South Kings Highway between Telegraph and Route 1 has some pretty serious and lengthy slopes to it. The first hill is like 100′ over maybe 1/4 or 1/2 mile, if I remember my Cub Scout orienteering correctly.
You will cross a peak heading south, drop back down into another valley, and climb another 150′ over 3/4 of a mile.
Further north, you could turn right on to Franklin Street. It climbs 40′ or so in just 300′ or so. That section of Franklin has warning signs and prohibitions for truck traffic.
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