Minnesota Administrative Rules
Agency 175 - Transportation Department
Chapter 8820 - LOCAL STATE-AID ROUTE STANDARDS, FINANCING
EXHIBITS, FIGURES, AND TABLES
Part 8820.9956 - MINIMUM VERTICAL CLEARANCES FOR UNDERPASSES
Universal Citation: MN Rules 8820.9956
Current through Register Vol. 49, No. 13, September 23, 2024
Underpass projects must meet or exceed the minimum dimensions indicated in the following design chart.
| Rural-Suburban Design, Vertical Clearance | Urban Design, Vertical Clearance | |
| (feet-inches) | (feet-inches) | |
| Highway under Roadway Bridge | 16-4 | 14-6 |
| Highway under Railroad Bridge | 16-4 | 14-6 |
| Highway under Pedestrian Bridge | 17-4 | 15-6 (a) |
| Highway under Sign Structure | 17-4 | 15-6 (a) |
| Railroad under Roadway Bridge (b) | 22-0 | 22-0 |
(a) For replacement of skyway structures, the minimum clearance over traveled way is the existing structure clear height.
(b) Variances to the required minimum may be granted by the commissioner of transportation. That approval eliminates the need for a state-aid variance.
Statutory Authority: MS s 162.02; 162.09
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