Western States 100 Aid Station Planner

The Western States 100-Mile Endurance Run covers 161km from Olympic Valley (formerly Squaw Valley) to Auburn, California, with 5,600m of elevation gain and 7,000m of loss. First run in 1974, it is one of the oldest and most prestigious 100-mile races in the world, with a lottery entry system due to extreme demand.

The heat factor. Western States is run in late June in the Sierra Nevada and Central Valley foothills. Canyon sections between Devil's Thumb (78km) and Foresthill (97km) regularly reach 35-40°C. Heat management is the primary cause of DNFs - pace plans that ignore the heat penalty in this section consistently fail. Plan for 20-30% slower actual pace in the canyon relative to your GAP target, and prioritise ice and fluid at every aid station.

Key sections. The opening climb from Olympic Valley to the Escarpment (4km, 700m D+) sets a high effort ceiling immediately. Robinson Flat (55km) is the last major crew point before the canyons. The climb from El Dorado Creek to Michigan Bluff (75-88km) in full afternoon heat is where the race separates finishers from DNFs. Foresthill (97km) is a major psychological milestone - from here the course is more runnable.

Crew access points: Robinson Flat (55km), Michigan Bluff (88km), Foresthill (97km), Rucky Chucky (122km), Auburn Lake Trails (130km), Robie Point (158km). Drop bags allowed at several additional checkpoints - check the current race guide.

Checkpoint data approximate - verify against current official race guide at wser.org before your race.

Most runners build race pacing plans by dividing total distance evenly - which ignores the fact that an uphill kilometre takes far longer than a flat one. This planner uses TrailMath's enhanced km-effort model to distribute your goal time proportionally by effort, not by distance.

The km-effort formula for each segment is: distance_km + gain_m/100 + loss_m/150. This is TrailMath's extension of the standard ITRA gain-only formula, which adds descent cost based on Minetti's finding that steep technical descents carry real metabolic load. A 5km segment with 500m of gain and 200m of loss has an effort of 5 + 5 + 1.3 = 11.3 km-effort - equivalent to running 11.3km flat. Time is allocated proportionally to this effort score.

Why gain and loss have asymmetric costs. Minetti et al. (2002) mapped the metabolic cost of inclined locomotion across gradients from -45% to +45%. The key findings: metabolic cost rises steeply above 15-20% uphill grade, making power hiking more energy-efficient than running on steep climbs. On descents, eccentric muscle loading (quads acting as brakes) creates its own metabolic cost - steep technical descents are far more demanding than the same gradient on a smooth fire road. The gain/100 + loss/150 asymmetry in the formula reflects this - gain is more costly per metre than loss, but loss is not free.

Power hiking threshold is flagged at segments where your computed pace exceeds 12 min/km (19 min/mile). This threshold corresponds to the crossover point where walking biomechanics become more efficient than running on steep uphill terrain. Strategic power hiking on marked segments preserves leg muscle for descents and reduces overall race time compared to running everything.

This km-effort model is the same formula used in TrailMath's training engine for load calculation (following Dan Johnston's asymmetric elevation scoring methodology), ensuring consistency between how your training load is measured and how your race effort is planned.

Minetti AE et al. (2002). Energy cost of walking and running at extreme uphill and downhill slopes. J Appl Physiol. 93(3):1039-46. Minetti AE et al. (1995). Mechanical determinants of gradient walking energetics in man. J Physiol. 481(Pt 1):235-43. ITRA. km-effort formula. International Trail Running Association. itra.run