Ridge and valley limestone
Five people, and the nearest restricted bridge half a mile off
The Orbisonia Quarry works crushed stone with five people on the books at Mine Safety and Health Administration, under New Enterprise Stone & Lime. Five people is a small crew, and the constraint on it starts almost at the gate.
The closest structure coded below legal loads lies 0.54 miles from this quarry. Route choice here begins before a loaded truck reaches a main road at all.
A hundred and one structures, and a circle that crosses into Maryland
The ten-mile circle here reaches over the state line, so the National Bridge Inventory’s count takes in both states: 101 structures, 100 of them Pennsylvania and one Maryland.
Six are coded posted for load and seven are coded below legal loads, three of those county-maintained.
Read it as an upper bound all the same, since a tighter crossing often lies between ten miles and twenty.
The nearest neighbour is thirteen miles away
So the lanes are long, and here they are also empty. The nearest other working the Mine Safety and Health Administration lists is the Mapleton Depot Plant about 13.2 miles north, with Grannas Bros. Sand & Stone about 13.4 miles west and Tasara Strips about 15.2 miles west.
Beyond those, Letterkenny Army Depot lies about 16.6 miles south-east, the Huntingdon yard about 20.4 miles north-west, St. Thomas Quarry about 21.7 miles south and the Chambersburg ramp about 25.0 miles south-east.
That is a different country from the metropolitan end of this state, where a dozen plants sit inside six miles. Here a truck covers real distance between jobs and the ridges make some of that distance cost more than it measures.
A truck out of the New Enterprise Stone & Lime pit has usually crossed that bridge 0.54 miles from the gate loaded and then run a long valley road towards the Mapleton Depot Plant 13.2 miles north. The first part is a load question and the second is a mileage one, and most trucks here carry both kinds of wear.
- At 19.1 metric tonnes the binding crossing 4.10 miles out takes more than most in this state, so a full load was often possible on the New Enterprise Stone lanes.
A small operation this far from the next one cannot spread a surplus truck across other sites, so when a contract ends the vehicle goes rather than moving on.
Between the Mapleton Depot Plant 13.2 miles north and the Huntingdon yard 20.4 miles north-west they turn up steadily.