7 bridges with vertical clearance data on SR-668 in Alaska. Lowest: 167.0ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 167.0ft | College-Johansn Nw | Noyes Slough Nw Ramp | Mile Point 0.1 | 1991 | Map |
| 169.3ft | Johansen Expresswy | College Road Uc | Mile Point 3.0 | 1991 | Map |
| 174.9ft | Johansen Expresswy | Noyes Slough (Geist Rd) | Mile Point 2.9 | 1991 | Map |
| 174.9ft | Johansen Expresswy | Noyes Slough (Geist Rd) | Mile Point 0.2 | 1993 | Map |
| 174.9ft | Johansn-College Sw | Noyes Slough Sw Ramp | Mile Point 2.9 | 1991 | Map |
| 179.1ft | Johansen Expresswy | Peger/Geist Overcrossing | Mile Point 1.0 | 1993 | Map |
| 230.0ft | Johansen Expresswy | Geist Road Overhead | Mile Point 1.4 | 1989 | Map |