Routes: every leg is a promise about time

Cairns get the attention because they're the destinations. But almost every trip I've been asked to rescue went wrong on a route — the space between two cairns that somebody budgeted with a feeling instead of a number.

What a route promises

A route says: starting from this cairn, moving this way, you reach the next cairn in this much time. Mode, distance, duration, gain. Four numbers, and together they're a promise about the hour you arrive — which is the number everything downstream depends on. Camp setup before dark. The last shuttle. The afternoon thunderstorm window above treeline.

Mode is the number people skip. Six miles on foot, on skis, and in a loaded canoe are three different afternoons. In Divide every route carries its mode explicitly — drive, hike, bike, ski, paddle, transit, walk — and the estimate follows the mode, not the crow.

Budgeting a leg honestly

Distance lies without gain. The honest unit for a hiking leg is something like effort-miles: a rough Sierra rule is a mile of flat per 750 ft of climb. That “six easy miles” to Cathedral Lakes carries 1,200 ft — call it eight. Loaded packs, altitude, and the fourth day of a trip each tax the number again. When I plan for clients, I budget the slowest plausible member of the group, not the strongest, and I round pessimistically. Arriving early is a pleasure; arriving late above treeline is a problem.

Slack is a feature of the route, not the day

Don't hide buffer in a vague “we'll start early.” Put it where the risk is: on the leg. The exposed leg gets the generous estimate; the forest walk out can run tight. When each route carries its own honest number, the day's total tells you the truth about the day — and a day whose truth is eleven moving hours is a plan asking to be redesigned, or divided.

A route is also where a plan branches. When one leg could reasonably go two ways — cables or Clouds Rest, high pass or valley walk-around — that leg is a division. That's the next essay.