Six Flags Discovery Kingdom ride reliability

1. 1THE FLASH Vertical Velocity6d 2h lost · 3 breakdowns · down on 18 of 18 days 0.8%
2. 2Seaside Railway5d 13h lost · 11 breakdowns · down on 18 of 18 days 9.3%
3. 3Ark4d 23h lost · 3 breakdowns · down on 18 of 18 days 18%
4. 4Kong3d 19h lost · 9 breakdowns · down on 18 of 18 days 38.8%
5. 5Monsoon Falls2d 13h lost · 7 breakdowns · down on 18 of 18 days 58.1%
6. 6White Water Safari2d 5h lost · 22 breakdowns · down on 18 of 18 days 63.3%
7. 7Boomerang Coast-to-Coaster1d 13h lost · 19 breakdowns · down on 18 of 18 days 74.9%
8. 8Elmer’s Weather Balloon Service1d 10h lost · 9 breakdowns · down on 18 of 18 days 77%
9. 9THE JOKER1d 8h lost · 45 breakdowns · down on 18 of 18 days 77.9%
10. 10Bugs’ Buccaneer1d 6h lost · 4 breakdowns · down on 18 of 18 days 80.2%
11. 11WONDER WOMAN Lasso of Truth1d 6h lost · 38 breakdowns · down on 18 of 18 days 80.4%
12. 12BATMAN: The Ride1d 4h lost · 20 breakdowns · down on 18 of 18 days 81.1%
13. 13Acme Fun Factory1d 1h lost · 6 breakdowns · down on 18 of 18 days 81.7%
14. 14Foghorn’s Seaport Railway1d 2h lost · 7 breakdowns · down on 18 of 18 days 82.6%
15. 15SkyScreamer22h 5m lost · 26 breakdowns · down on 18 of 18 days 85.3%
16. 16SUPERMAN Ultimate Flight17h 53m lost · 32 breakdowns · down on 18 of 18 days 87.7%
17. 17Medusa17h 26m lost · 28 breakdowns · down on 18 of 18 days 88.2%
18. 18Sidewinder Safari17h 14m lost · 14 breakdowns · down on 18 of 18 days 88.4%
19. 19Yosemite Sam's Flight School12h 20m lost · 9 breakdowns · down on 18 of 18 days 91.5%
20. 20Cobra11h 30m lost · 14 breakdowns · down on 18 of 18 days 92.3%
21. 21Zoe's Tree House11h 30m lost · 9 breakdowns · down on 18 of 18 days 92.6%
22. 22Thrilla Gorilla10h 14m lost · 5 breakdowns · down on 18 of 18 days 93.2%
23. 23Monkey Business10h 0m lost · 15 breakdowns · down on 18 of 18 days 93.3%
24. 24Boardwalk Bumper Buggies10h 15m lost · 11 breakdowns · down on 18 of 18 days 93.4%
25. 25Road Runner Express9h 16m lost · 5 breakdowns · down on 18 of 18 days 93.9%
26. 26Congo Queen8h 5m lost · 9 breakdowns · down on 18 of 18 days 94.6%
27. 27Seaport Carousel7h 51m lost · 2 breakdowns · down on 18 of 18 days 94.8%
28. 28Scat-A-Bout7h 49m lost · 10 breakdowns · down on 18 of 18 days 94.9%
29. 29Pepe Le Pew’s Rafts of Romance7h 44m lost · 7 breakdowns · down on 18 of 18 days 94.9%
30. 30Safari Jeep Tours7h 40m lost · 8 breakdowns · down on 18 of 18 days 94.9%
31. 31Wave Swinger7h 9m lost · 10 breakdowns · down on 18 of 18 days 95.2%
32. 32Sylvester's Pounce & Bounce6h 57m lost · 6 breakdowns · down on 18 of 18 days 95.4%
33. 33Air Penguins6h 11m lost · 5 breakdowns · down on 18 of 18 days 95.9%
34. 34Nairobi’s Look Out Balloons5h 55m lost · 5 breakdowns · down on 18 of 18 days 96.1%
35. 35Merlin’s Seaside Tours5h 30m lost · 3 breakdowns · down on 18 of 18 days 96.4%
36. 36Taz’s Typhoon4h 45m lost · 3 breakdowns · down on 18 of 18 days 96.9%

Breakdowns cluster at 5pm, with 80 of the 421 closures that started before the park's final hour beginning then - so the ride you most want is safest earlier in the day, not saved for last. A further 210 rides simply were not running at opening, which is a late start rather than a fault and is counted separately. The other 18 closures start in the 7pm hour, when the park is shutting - those are rides finishing their day, not failing, so they are left out here.

The worst day in this window was 10 Oct, when 37.6% of the park's ride hours were lost and 36 of 36 rides went down at some point.