John Clark

Born : 1942 Cat. M80 Ultrarunner since 1980

DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.

DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details

Countries visited ?

United States

43,6%

Rank quotient ?This runner's calculation uses 89 eligible race(s): Σ(rank − 1) = 6 027; Σ finishers = 13 816. 6 027 / 13 816 × 100 = 43.62%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed89

Km — ultra races5 813 km

> 100 km2

Longest race115,9 km

7th Lake Tahoe 72 Miler — 17/9/1982

Km per year (ultra races)

2022

2023

2024

2025

2026

Race types (share of distance)

Road28,3%

Trail71,7%

Records

50 km4h35'55 50 mi7h12'35

HISTORY

89 race(s)

Date		Race	Perf.	Rk
1999
13.11	50km	4th Helen Klein Ultra Classic 50km	5:59:02 h	17
1998
06.09	50km	4th Run On The Sly 50 km	7:06:21 h	42
29.08	31.5mi	1st Tamalpa Headlands 50K	7:14:44 h	90
01.08	50km	17th Skyline 50k Endurance Run	6:22:56 h	129
04.04	50mi	19th American River 50 Mile Endurance Run	9:50:46 h	284
07.02	50km	20th Jed Smith Ultra Classic - 50 km Race	5:12:33 h	60
1997
13.09	50mi	3rd Cameron Park 50 Mile	8:39:58 h	17
06.09	50km	3rd Point Reyes 50K	6:29:18 h	97
31.08	50km	3rd Run On The Sly 50 km	6:21:47 h	24
02.08	50km	16th Skyline 50k Endurance Run	6:13:22 h	137
26.04	50mi	California 50 Mile Endurance Run	8:29:28 h	26
05.04	50mi	18th American River 50 Mile Endurance Run	9:06:46 h	205
18.01	50km	19th Jed Smith Ultra Classic - 50 km Race	4:48:01 h	60
1996
16.11	50mi	1st Helen Klein Ultra Classic 50mi	8:37:10 h	21
12.10	50mi	14th Dick Collins Firetrails 50 Mile	9:45:29 h	44
24.08	50km	2nd Point Reyes 50K	6:05:03 h	83
17.08	50mi	2nd Cameron Park 50 Mile	9:20:28 h	28
03.08	50km	15th Skyline 50k Endurance Run	5:41:20 h	86
06.04	50mi	17th American River 50 Mile Endurance Run	9:27:33 h	199
03.02	50km	18th Jed Smith Ultra Classic - 50 km Race	5:00:30 h	78
1995
28.10	52.4mi	9th Sierra Nevada Endurance 52 Mile Run	11:02:14 h	36
02.09	50km	1st Point Reyes 50K	5:54:19 h	64
06.08	50km	14th Skyline 50k Endurance Run	5:37:50 h	68
01.04	50mi	16th American River 50 Mile Endurance Run	9:21:24 h	229
05.02	50km	17th Jed Smith Ultra Classic - 50 km Race	4:36:40 h	30
1994
07.08	50km	13th Skyline 50k Endurance Run	5:31:52 h	62
07.05	50km	11th Quicksilver 50 km Endurance Run	6:16:34 h	20
02.04	50mi	15th American River 50 Mile Endurance Run	8:34:58 h	141
12.03	50km	5th Way Too Cool 50K Endurance Run	5:39:07 h	162
05.02	50km	16th Jed Smith Ultra Classic - 50 km Race	4:35:55 h	30
1993
14.11	50mi	Gibson Ranch Last Chance 50 Mile	9:03:30 h	31
23.10	52.4mi	7th Sierra Nevada Endurance 52 Mile Run	10:39:27 h	36
09.10	50mi	11th Dick Collins Firetrails 50 Mile	9:24:42 h	33
08.05	50km	10th Quicksilver 50 km Endurance Run	6:22:23 h	74
03.04	50mi	14th American River 50 Mile Endurance Run	8:31:41 h	126
13.03	50km	4th Way Too Cool 50K Endurance Run	5:27:10 h	114
06.02	50km	15th Jed Smith Ultra Classic - 50 km Race	4:57:10 h	57
06.02	50mi	15th Jed Smith Ultra Classic - 50 Mile Race	8:16:46 h	18
1992
24.10	52.4mi	6th Sierra Nevada Endurance 52 Mile Run	9:03:14 h	8
10.10	50mi	10th Dick Collins Firetrails 50 Mile	9:14:37 h	13
19.09	50km	Pacific Crest Trail 50 km	6:44:55 h	35
02.08	50km	11th Skyline 50k Endurance Run	5:42:40 h	47
17.05	50km	6th Ohlone 50K Wilderness Run	6:15:36 h	33
16.05	50km	8th Silver State 50 km	6:47:53 h	17
04.04	50mi	13th American River 50 Mile Endurance Run	8:23:05 h	109
08.02	50km	14th Jed Smith Ultra Classic - 50 km Race	4:43:20 h	38
08.02	50mi	14th Jed Smith Ultra Classic - 50 Mile Race	8:45:15 h	50
1991
10.08	50km	Eldorado Gold 50 km	7:32:00 h	21
03.08	50km	10th Skyline 50k Endurance Run	5:53:45 h	41
19.05	50km	5th Ohlone 50K Wilderness Run	6:26:02 h	28
11.05	50km	8th Quicksilver 50 km Endurance Run	5:47:24 h	30
06.04	50mi	12th American River 50 Mile Endurance Run	8:42:30 h	126
09.02	50mi	13th Jed Smith Ultra Classic - 50 Mile Race	7:12:35 h	28
1990
15.09	50km	Pacific Crest Trail 50 km	6:47:00 h	44
04.08	50km	9th Skyline 50k Endurance Run	5:22:29 h	29
12.05	50mi	7th Quicksilver 50 Mile Endurance Run	9:34:16 h	21
07.04	50mi	11th American River 50 Mile Endurance Run	8:44:02 h	161
10.03	50km	1st Way Too Cool 50K Endurance Run	5:57:35 h	76
11.02	50mi	12th Jed Smith Ultra Classic - 50 Mile Race	7:24:15 h	25
1989
14.10	50mi	7th Dick Collins Firetrails 50 Mile	9:55:22 h	17
16.09	50km	Pacific Crest Trail 50 km	6:13:19 h	44
09.04	50mi	10th American River 50 Mile Endurance Run	9:18:09 h	92
11.02	50mi	11th Jed Smith Ultra Classic - 50 Mile Race	7:55:15 h	31
1988
17.09	50km	Pacific Crest Trail 50 km	6:38:05 h	38
07.08	50km	7th Skyline 50k Endurance Run	4:56:49 h	29
10.04	50mi	9th American River 50 Mile Endurance Run	8:53:10 h	70
1987
10.10	50mi	5th Dick Collins Firetrails 50 Mile	9:19:08 h	23
20.09	50km	Pacific Crest Trail 50 km	6:58:19 h	58
01.08	50km	6th Skyline 50k Endurance Run	5:48:35 h	37
12.04	50mi	8th American River 50 Mile Endurance Run	8:32:27 h	104
07.02	50mi	9th Jed Smith Ultra Classic - 50 Mile Race	8:20:33 h	6
1986
03.08	50km	5th Skyline 50k Endurance Run	5:42:33 h	52
13.04	50mi	7th American River 50 Mile Endurance Run	9:05:04 h	147
08.02	50mi	8th Jed Smith Ultra Classic - 50 Mile Race	7:57:17 h	32
1985
04.08	50km	4th Skyline 50k Endurance Run	5:28:53 h	127
14.04	50mi	6th American River 50 Mile Endurance Run	9:03:17 h	83
1984
05.08	50km	3rd Skyline 50k Endurance Run	5:20:18 h	113
05.05	50km	Good Old Country 50 km	5:27:10 h	24
15.04	50mi	5th American River 50 Mile Endurance Run	8:35:45 h	111
1983
09.10	50km	Iron Mountain 50 km	5:45:22 h	15
07.08	50km	2nd Skyline 50k Endurance Run	5:37:48 h	63
17.04	50mi	4th American River 50 Mile Endurance Run	9:19:09 h	232
1982
17.09	72mi	7th Lake Tahoe 72 Miler	14:31:41 h	42
01.08	50km	1st Skyline 50k Endurance Run	4:55:16 h	105
1981
29.11	50km	Ultra Challenge 50 km	5:39:49 h	46
12.04	50mi	2nd American River 50 Mile Endurance Run	9:25:05 h	166
15.02	50mi	4th Jed Smith Ultra Classic - 50 Mile Race	8:54:59 h	91
1980
19.09	72mi	5th Lake Tahoe 72 Miler	14:23:50 h	47
17.02	50mi	Feather River Fifty - Pacific AAU 50-Mile Championship	8:50:17 h	33

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	17/9/1982	7th Lake Tahoe 72 Miler	115,87	×2
✓ 2	19/9/1980	5th Lake Tahoe 72 Miler	115,87	×2
✓ 3	28/10/1995	9th Sierra Nevada Endurance 52 Mile Run	84,33	×1
✓ 4	23/10/1993	7th Sierra Nevada Endurance 52 Mile Run	84,33	×1
✓ 5	24/10/1992	6th Sierra Nevada Endurance 52 Mile Run	84,33	×1
✓ 6	4/4/1998	19th American River 50 Mile Endurance Run	80,47	×1
✓ 7	13/9/1997	3rd Cameron Park 50 Mile	80,47	×1
✓ 8	26/4/1997	California 50 Mile Endurance Run	80,47	×1
✓ 9	5/4/1997	18th American River 50 Mile Endurance Run	80,47	×1
✓ 10	16/11/1996	1st Helen Klein Ultra Classic 50mi	80,47	×1
✓ 11	12/10/1996	14th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 12	17/8/1996	2nd Cameron Park 50 Mile	80,47	×1
✓ 13	6/4/1996	17th American River 50 Mile Endurance Run	80,47	×1
✓ 14	1/4/1995	16th American River 50 Mile Endurance Run	80,47	×1
✓ 15	2/4/1994	15th American River 50 Mile Endurance Run	80,47	×1
✓ 16	14/11/1993	Gibson Ranch Last Chance 50 Mile	80,47	×1
✓ 17	9/10/1993	11th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 18	3/4/1993	14th American River 50 Mile Endurance Run	80,47	×1
✓ 19	6/2/1993	15th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 20	10/10/1992	10th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 21	4/4/1992	13th American River 50 Mile Endurance Run	80,47	×1
✓ 22	8/2/1992	14th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 23	6/4/1991	12th American River 50 Mile Endurance Run	80,47	×1
✓ 24	9/2/1991	13th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 25	12/5/1990	7th Quicksilver 50 Mile Endurance Run	80,47	×1
✓ 26	7/4/1990	11th American River 50 Mile Endurance Run	80,47	×1
✓ 27	11/2/1990	12th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 28	14/10/1989	7th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 29	9/4/1989	10th American River 50 Mile Endurance Run	80,47	×1
✓ 30	11/2/1989	11th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 31	10/4/1988	9th American River 50 Mile Endurance Run	80,47	×1
✓ 32	10/10/1987	5th Dick Collins Firetrails 50 Mile	80,47	×1
✓ 33	12/4/1987	8th American River 50 Mile Endurance Run	80,47	×1
✓ 34	7/2/1987	9th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 35	13/4/1986	7th American River 50 Mile Endurance Run	80,47	×1
✓ 36	8/2/1986	8th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 37	14/4/1985	6th American River 50 Mile Endurance Run	80,47	×1
✓ 38	15/4/1984	5th American River 50 Mile Endurance Run	80,47	×1
✓ 39	17/4/1983	4th American River 50 Mile Endurance Run	80,47	×1
✓ 40	12/4/1981	2nd American River 50 Mile Endurance Run	80,47	×1
✓ 41	15/2/1981	4th Jed Smith Ultra Classic - 50 Mile Race	80,47	×1
✓ 42	17/2/1980	Feather River Fifty - Pacific AAU 50-Mile Championship	80,47	×1
✓ 43	29/8/1998	1st Tamalpa Headlands 50K	50,69	×1
✓ 44	13/11/1999	4th Helen Klein Ultra Classic 50km	50,00	×1
✓ 45	6/9/1998	4th Run On The Sly 50 km	50,00	×1
✓ 46	1/8/1998	17th Skyline 50k Endurance Run	50,00	×1
✓ 47	7/2/1998	20th Jed Smith Ultra Classic - 50 km Race	50,00	×1
✓ 48	6/9/1997	3rd Point Reyes 50K	50,00	×1
✓ 49	31/8/1997	3rd Run On The Sly 50 km	50,00	×1
✓ 50	2/8/1997	16th Skyline 50k Endurance Run	50,00	×1
51	18/1/1997	19th Jed Smith Ultra Classic - 50 km Race	50,00	×1
52	24/8/1996	2nd Point Reyes 50K	50,00	×1
53	3/8/1996	15th Skyline 50k Endurance Run	50,00	×1
54	3/2/1996	18th Jed Smith Ultra Classic - 50 km Race	50,00	×1
55	2/9/1995	1st Point Reyes 50K	50,00	×1
56	6/8/1995	14th Skyline 50k Endurance Run	50,00	×1
57	5/2/1995	17th Jed Smith Ultra Classic - 50 km Race	50,00	×1
58	7/8/1994	13th Skyline 50k Endurance Run	50,00	×1
59	7/5/1994	11th Quicksilver 50 km Endurance Run	50,00	×1
60	12/3/1994	5th Way Too Cool 50K Endurance Run	50,00	×1
61	5/2/1994	16th Jed Smith Ultra Classic - 50 km Race	50,00	×1
62	8/5/1993	10th Quicksilver 50 km Endurance Run	50,00	×1
63	13/3/1993	4th Way Too Cool 50K Endurance Run	50,00	×1
64	19/9/1992	Pacific Crest Trail 50 km	50,00	×1
65	2/8/1992	11th Skyline 50k Endurance Run	50,00	×1
66	17/5/1992	6th Ohlone 50K Wilderness Run	50,00	×1
67	16/5/1992	8th Silver State 50 km	50,00	×1
68	10/8/1991	Eldorado Gold 50 km	50,00	×1
69	3/8/1991	10th Skyline 50k Endurance Run	50,00	×1
70	19/5/1991	5th Ohlone 50K Wilderness Run	50,00	×1
71	11/5/1991	8th Quicksilver 50 km Endurance Run	50,00	×1
72	15/9/1990	Pacific Crest Trail 50 km	50,00	×1
73	4/8/1990	9th Skyline 50k Endurance Run	50,00	×1
74	10/3/1990	1st Way Too Cool 50K Endurance Run	50,00	×1
75	16/9/1989	Pacific Crest Trail 50 km	50,00	×1
76	17/9/1988	Pacific Crest Trail 50 km	50,00	×1
77	7/8/1988	7th Skyline 50k Endurance Run	50,00	×1
78	20/9/1987	Pacific Crest Trail 50 km	50,00	×1
79	1/8/1987	6th Skyline 50k Endurance Run	50,00	×1
80	3/8/1986	5th Skyline 50k Endurance Run	50,00	×1
81	4/8/1985	4th Skyline 50k Endurance Run	50,00	×1
82	5/8/1984	3rd Skyline 50k Endurance Run	50,00	×1
83	5/5/1984	Good Old Country 50 km	50,00	×1
84	9/10/1983	Iron Mountain 50 km	50,00	×1
85	7/8/1983	2nd Skyline 50k Endurance Run	50,00	×1
86	1/8/1982	1st Skyline 50k Endurance Run	50,00	×1
87	29/11/1981	Ultra Challenge 50 km	50,00	×1