Six Flags Great America ride reliability

1. 1AQUAMAN™ Splashdown8d 17h lost · 4 breakdowns · down on 27 of 27 days 3%
2. 2Scenic Railway County Fair Station6d 6h lost · 15 breakdowns · down on 27 of 27 days 29.9%
3. 3Krazy Kars5d 4h lost · 19 breakdowns · down on 27 of 27 days 42.6%
4. 4Sprocket Rockets4d 15h lost · 18 breakdowns · down on 26 of 27 days 48.6%
5. 5Lady Bugs4d 5h lost · 17 breakdowns · down on 26 of 27 days 51.9%
6. 6Raging Bull4d 2h lost · 29 breakdowns · down on 27 of 27 days 52.7%
7. 7Bouncer4d 3h lost · 14 breakdowns · down on 26 of 27 days 53%
8. 8Tot's Livery4d 3h lost · 12 breakdowns · down on 26 of 27 days 53.3%
9. 9Red Baron4d 2h lost · 10 breakdowns · down on 26 of 27 days 53.6%
10. 10ZoomJets4d 1h lost · 10 breakdowns · down on 26 of 27 days 53.8%
11. 11Krazy Kups4d 1h lost · 9 breakdowns · down on 26 of 27 days 53.9%
12. 12Up, Up & Away4d 1h lost · 9 breakdowns · down on 26 of 27 days 53.9%
13. 13Demon3d 15h lost · 21 breakdowns · down on 26 of 27 days 60.3%
14. 14American Eagle3d 3h lost · 25 breakdowns · down on 27 of 27 days 64%
15. 15Maxx Force3d 7h lost · 32 breakdowns · down on 27 of 27 days 64.8%
16. 16American Eagle Red Side2d 21h lost · 20 breakdowns · down on 26 of 27 days 68.3%
17. 17Big Easy Balloons2d 15h lost · 6 breakdowns · down on 26 of 27 days 72%
18. 18Sky Striker1d 23h lost · 75 breakdowns · down on 27 of 27 days 78.7%
19. 19THE JOKER™ Free-Fly Coaster1d 13h lost · 25 breakdowns · down on 27 of 27 days 82%
20. 20Sky Trek Tower1d 14h lost · 12 breakdowns · down on 27 of 27 days 82.2%
21. 21Chubasco1d 13h lost · 22 breakdowns · down on 27 of 27 days 82.8%
22. 22Whizzer1d 19h lost · 35 breakdowns · down on 27 of 27 days 83.4%
23. 23Little Dipper1d 14h lost · 14 breakdowns · down on 26 of 27 days 84.8%
24. 24Wrath of Rakshasa1d 2h lost · 26 breakdowns · down on 26 of 27 days 89.6%
25. 25Goliath21h 15m lost · 26 breakdowns · down on 27 of 27 days 89.6%
26. 26JUSTICE LEAGUE™: Battle for METROPOLIS20h 39m lost · 22 breakdowns · down on 26 of 27 days 90%
27. 27Giant Drop22h 49m lost · 28 breakdowns · down on 27 of 27 days 90.1%
28. 28The Lobster20h 44m lost · 8 breakdowns · down on 27 of 27 days 91.1%
29. 29Triple Play16h 35m lost · 12 breakdowns · down on 26 of 27 days 91.5%
30. 30X Flight19h 2m lost · 37 breakdowns · down on 27 of 27 days 91.7%
31. 31Ricochet17h 40m lost · 24 breakdowns · down on 27 of 27 days 92.4%
32. 32THE FLASH™: Vertical Velocity17h 23m lost · 25 breakdowns · down on 27 of 27 days 92.6%
33. 33SUPERMAN™: Ultimate Flight15h 3m lost · 23 breakdowns · down on 27 of 27 days 93.1%
34. 34Viper14h 8m lost · 15 breakdowns · down on 27 of 27 days 93.7%
35. 35BATMAN™: The Ride12h 56m lost · 28 breakdowns · down on 27 of 27 days 94.1%
36. 36Columbia Carousel12h 46m lost · 18 breakdowns · down on 26 of 27 days 94.2%
37. 37Fiddler’s Fling13h 20m lost · 14 breakdowns · down on 27 of 27 days 94.7%
38. 38THE DARK KNIGHT™ Coaster10h 47m lost · 7 breakdowns · down on 26 of 27 days 94.8%
39. 39Rue Le Dodge11h 16m lost · 5 breakdowns · down on 26 of 27 days 95.1%
40. 40Hometown Fun Machine10h 35m lost · 5 breakdowns · down on 27 of 27 days 95.8%
41. 41River Rocker8h 42m lost · 9 breakdowns · down on 27 of 27 days 96%
42. 42DC Super-Villains Swing™9h 9m lost · 4 breakdowns · down on 26 of 27 days 96.1%
43. 43Condor6h 48m lost · 6 breakdowns · down on 26 of 27 days 97.1%

Breakdowns cluster at 5pm, with 148 of the 762 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 405 rides simply were not running at opening, which is a late start rather than a fault and is counted separately. The other 33 closures start in the 10pm 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 27 Sept, when 42.3% of the park's ride hours were lost and 45 of 45 rides went down at some point.