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Arizona Highway 366 (Swift Trail) provides access to within two miles of the Mount
Graham International Observatory (MGIO). The access road to the observatory site is
highlighted below. Landmarks and mile posts along the route are listed.
| Location |
Mile Post |
Miles from Base Camp |
| MGIO Base camp |
114.7 |
0.0 |
| 4,000' Elevation Marker |
117.5 |
2.8 |
| Coronado Forest Boundary |
118.5 |
3.8 |
| FR-667 Intersection |
120.4 |
5.5 |
| 5,000' Elevation Marker |
120.4 |
5.5 |
| Noon Creek |
121.0 |
6.2 |
| T329 Angle Orchard |
121.4 |
6.4 |
| 6,000' Elevation Marker |
123.3 |
8.3 |
| Wet Canyon |
123.6 |
8.6 |
| Arcadia Campground |
125.5 |
10.4 |
| 7,000' Elevation Marker |
126.6 |
11.4 |
| Turkey Flat ( Old General Store |
127.9 |
12.7 |
| 8,000' Elevation Marker |
130.1 |
14.9 |
| Lady Bug Saddle |
131.0 |
15.8 |
| 9,000' Elevation Marker |
134.5 |
19.1 |
| Snow flat Campground |
135.2 |
19.8 |
| Shannon Campground &
Heliograph Peak Intersection |
135.8 |
20.4 |
| FR-507 Intersection (High Peak) |
136.1 |
20.7 |
| Swift Trail (Hwy 366) Main Gate |
136.2 |
20.8 |
| Treasure Park Campground |
137.0 |
21.6 |
| Hospital Flat Campground |
137.2 |
21.8 |
| Grant Hill Intersection |
137.8 |
22.4 |
| Grant Creek |
139.2 |
23.6 |
| Cunningham Campground |
139.9 |
24.3 |
| Moonshine Creek |
140.6 |
25.0 |
| Post Creek |
141.4 |
25.8 |
| Ft. Grant Vista Overlook |
141.8 |
26.2 |
| MGIO - Emerald Peak
Access
Road Intersection |
142.3 |
26.7 |
| Old Columbine - Bible Camp
Road Intersection |
143.2 |
27.6 |
| Public Horse Corral |
143.3 |
27.7 |
| Soldier Creek Campgrounds |
143.7 |
28.1 |
| Riggs Lake Intersection |
147.5 |
32.2 |
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