Johnson Power Rankings
The world authority on 200+ mile ultramarathon running — weekly, data-driven, course-difficulty-adjusted.

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Mary Deane Davis

Women · Americas

Ratings

Athlete ratings by board
BoardGenderRatingRankMove
ContinuousWomen1,66641• new
OverallWomen1,66641• new

Why this rank

The Overall rating is the time-decayed mean of this athlete’s best 3 in-window performance scores (highlighted below). Each score = base × difficulty × field-strength × quality.

Career results (200+ mile tier)

Cocodona 250 Mile Race · May 4, 2026 · 250mi continuouscounts toward rating
place 197 · 4d 19:46:19 · difficulty 2.45 · field 2.30 · quality 0.27
1,533
Moab 240 Endurance Run · Oct 10, 2025 · 240mi continuouscounts toward rating
place 113 · 4d 16:30:17 · difficulty 1.95 · field 2.31 · quality 0.31
1,399
Cocodona 250 Mile Race · May 5, 2025 · 250mi continuouscounts toward rating
DNF · 250mi covered · difficulty 2.45 · field 2.43 · quality 1.00
2,085
Cocodona 250 Mile Race · May 6, 2024 · 250mi continuous
DNF · 250mi covered · difficulty 2.45 · field 2.43 · quality 1.00
2,087
Tahoe 200 Mile Endurance Run · Jun 17, 2022 · 200mi continuous
place 125 · 4d 01:52:50 · difficulty 2.35 · field 2.02 · quality 0.37
1,781