1. Start on Wanaque Ridge Spur Trail, heading SE.
2. 450 ftBear right, heading S.
3. 0.2 miTurn left, heading S.
4. 0.2 miTurn left onto Algonquin Gas Transmission Service Road, heading SE.
5. 0.1 miBear left onto Algonquin Gas Transmission Service Road/Castle Loop Trail, heading E.
6. 250 ftContinue straight onto Castle Loop Trail, heading NE.
7. 0.1 miPass Castle Viewpoint.
8. 100 ftTurn left onto Cannonball Trail, heading E.
9. 0.1 miBear left onto Cannonball / Hoeferlin Memorial Trail, heading N.
10. 0.6 miBear right onto Algonquin Gas Service Road, heading N.
11. 0.4 miBear right onto Matapan Rock Trail, heading E.
12. 0.1 miContinue straight onto Hilltop Road, heading NE.
13. 0.2 miSharp left onto Mary Post Road/Schuber Trail, heading NE.
14. 0.3 miContinue straight onto Old Guard/Schuber Trail, heading E.
15. 0.2 miBear left onto Old Guard Trail, heading NE.
16. 0.2 miPass Laurel Hollow.
17. 0.2 miPass Middle Valley Lookout.
18. 150 ftBear left, heading N.
19. 150 ftTurn right onto Algonquin Gas Service Road, heading N.
20. 0.3 miTurn right onto Yellow Trail, heading NE.
21. 0.1 miSharp left onto Schuber Trail, heading NE.
22. 0.4 miTurn right onto Mountain Road, heading N.
23. 1 miTurn right onto Rocky Mountain Connector, heading N.
24. 0.2 miContinue straight onto Ridge Loop Trail, heading NE.
25. 450 ftPass Mill Race Ruins.
26. 0.3 miPass MacMillan Reservoir.
27. 250 ftContinue straight onto Reservoir Loop, heading SE.
28. 50 ftContinue straight onto Ridge Loop Trail, heading SE.
29. 0.1 miTurn right onto Ridge/Vista Loop Trail, heading SE.
30. 450 ftContinue straight onto Ridge Loop Trail, heading SE.
31. 0.1 miBear right, heading SE.
32. 0.1 miPass Scarlet Oak Pond.
33. 350 ftContinue straight onto Vista-Ridge Connector Trail, heading SE.
34. 250 ftContinue straight onto Pond/Vista Loop Trail, heading E.
35. 100 ftContinue straight onto Vista Spur Trail, heading SE.
36. 0.1 miPass Vista.
37. 450 ftReach MacMillan Reservoir, then turn around and head back the way you came.
38. 0.2 miContinue straight onto Pond/Vista Loop Trail, heading SE.
39. 150 ftContinue straight onto Vista-Ridge Connector Trail, heading SE.
40. 0.2 miBear left onto Ridge Loop Trail, heading NW.
41. 0.1 miContinue straight onto Ridge/Vista Loop Trail, heading NW.
42. 450 ftTurn left onto Ridge Loop Trail, heading W.
43. 500 ftContinue straight onto Reservoir Loop, heading SW.
44. 50 ftContinue straight onto Ridge Loop Trail, heading SW.
45. 0.4 miContinue straight onto Rocky Mountain Connector, heading NW.
46. 0.2 miTurn left onto Schuber Trail, heading NW.
47. 1 miTurn left, heading SW.
48. 0.4 miSharp right onto Yellow Trail, heading W.
49. 0.1 miTurn left onto Algonquin Gas Service Road, heading NW.
50. 0.4 miTurn left onto Old Guard Trail, heading SW.
51. 100 ftTurn right, heading SW.
52. 0.4 miBear right onto Old Guard/Schuber Trail, heading SW.
53. 0.2 miContinue straight onto Mary Post Road/Schuber Trail, heading S.
54. 0.3 miSharp right onto Hilltop Road, heading S.
55. 0.2 miContinue straight onto Matapan Rock Trail, heading S.
56. 0.1 miBear left onto Algonquin Gas Service Road, heading SW.
57. 0.4 miBear left onto Cannonball / Hoeferlin Memorial Trail, heading N.
58. 0.6 miBear right onto Cannonball Trail, heading S.
59. 0.1 miTurn right onto Castle Loop Trail, heading S.
60. 0.2 miContinue straight onto Algonquin Gas Transmission Service Road/Castle Loop Trail, heading SW.
61. 250 ftBear right onto Algonquin Gas Transmission Service Road, heading SW.
62. 0.1 miTurn right, heading SW.
63. 0.2 miTurn right onto Wanaque Ridge Spur Trail, heading SW.
64. 0.2 miBear left, heading S.
65. 50 ftArrive back at the trailhead.

Each distance is the walk from the previous step. Tap a step for a map of its junction.

Trail map, photos and weather for this hike: www.ambleway.com/hikes/macmillan-reservoir-middle-valley-lookout-out-back-17-sights-20-km