Development of the Municipal Roads General Permit
Documents and Frequently Asked Questions
Permit Development Timeline
Municipal Development of a Road Stormwater Management Plan
Permit Requirements for Existing Roads
Permit Requirements for New Projects
This general permit is intended to achieve significant reductions in stormwater-related erosion from municipal roads, both paved and unpaved. Municipalities will implement a customized, multi-year plan to stabilize their road drainage system. The plan will include bringing road drainage systems up to basic maintenance standards, and additional corrective measure to reduce erosion as necessary to meet a TMDL or other water quality restoration effort. The permit is required by Act 64, the Vermont Clean Water Act, and the Lake Champlain Phase I TMDL.
For more information on the DEC Municipal Roads program and the development of the Municipal Roads General Permit, contact Jim Ryan by email or at (802) 490-6140.
- Final Draft Municipal Roads General Permit (MRGP) Permit for Public Review
- Municipal Roads Outreach Materials
- MRGP Draft Standards
- Road Erosion Inventories and related documents
- Intermittent Stream Culvert Sizing Guidance
- Funding Assistance
As a first step municipalities will inventory the sections of their road networks that are hydrologically-connected to surface waters through ditches, culverts or other drainage structures. Hydrologically-connected roads present substantially greater risks to water quality. A GIS map layer of hydrologically-connected municipal road segments is available at: http://anr.vermont.gov/maps/nr-atlas.
The second step will be developing Implementation Plans that will prioritize road segment remediation work to bring non-complying road segments up to MRGP standards. Implementation Plans will include current MRGP compliance status (whether individual road segments Fully Meet, Partially Meet, or Do Not Meet standards), remediation schedule for the coming year, and road segments worked on in the previous calendar year now meeting standards. Towns will update their Implementation Plans annually. Standards include measures such as:
- Grass and stone-lined drainage ditches, stone check-dams, and distributed flow infiltration
- Cross culverts and turnouts disconnecting road stormwater
- Road crowning, removal of grader berms, and lowering of high road shoulders
- Upgrading road drainage culverts and installing outlet stabilization and/or headwalls where erosion is present
- Soils exposed by maintenance would be seeded and mulched or otherwise stabilized
- Stabilizing catch basin outlets
Class 4 roads that are adversely affecting water quality may require the installation of best management practices to reduce severe (gully) erosion, but will not be required to be open to travel as part of this permit. (See below for additional information on MRGP requirements for class 4 roads.)
In-Culverts and bridges:
- No new requirements to replace perennial stream crossings, but other conveyances and intermittent stream culverts will be covered by the permit and may require upgrades or retrofits.
- Maintenance and construction activities would continue to conform to the ANR Stream Alteration General Permit.
Designed to Vermont Stormwater Manual if over permit threshold of 1 acre impervious surface, or >5,000 square foot expansion