The big picture
The Big Darby Accord represents a multi-jurisdictional planning compact established to balance growth pressures with strict conservation standards across the sensitive Big Darby Creek watershed in western Franklin County. While it serves as an environmental bulwark, the presence of major high-voltage transmission infrastructure along Hilliard’s western edge makes the periphery an area of interest for large-scale development.
Why it matters
The Big Darby Creek is recognized as a National Scenic River and one of the Midwest’s most biodiverse freshwater ecosystems. Rapid development throughout Central Ohio frequently runs up against the watershed’s strict environmental boundaries, requiring commercial, industrial, and residential developers to navigate rigid conservation tiers, land-use maps, and stormwater requirements.
Catch up quick
Established in 2006 following years of intergovernmental negotiations and environmental impact assessments, the Accord brought together 10 local jurisdictions to craft a shared master land-use and watershed-protection plan:
- Participating partners: Franklin County, the City of Hilliard, the City of Columbus, and seven surrounding townships (including Brown, Norwich, Pleasant, Prairie, Washington, and others across the watershed).
- Core structure: It instituted an intergovernmental review panel—the Big Darby Accord Advisory Panel (BDAAP)—to review proposed rezonings, comprehensive plan amendments, and development plans against the Accord’s shared policies.
Driving the news
High-voltage transmission corridors along Hilliard’s western boundary—specifically tracing Roberts Road, Alton Darby Creek Road, and Hayden Run Road—run adjacent to the Accord overlay. As regional demand for power-intensive infrastructure and tech campus sites accelerates across Central Ohio, developers are actively scrutinizing sites near these transmission lines, bringing regional infrastructure demand directly to the edge of the preservation boundary.
The big picture
The intersection of heavy utility capacity and conservation policy creates a hard edge between rural watershed protection and modern utility infrastructure. Western Franklin County remains one of the few areas where major power corridors coexist directly with severe environmental restrictions.
Zoom in
Within the Accord’s footprint, development is governed by rigorous design and ecological mandates:
- Conservation Tiers & Open Space: Strict development conservation designs require substantial contiguous open space preservation (often 50% or higher depending on the tier).
- Stormwater & Groundwater Recharge: Developments must meet comprehensive stormwater mitigation criteria, prioritizing infiltration and low-impact development (LID) techniques to maintain base flow and cold-water streams without thermal pollution or nutrient runoff.
- Density Caps: Density allocations are intentionally constrained to steer high-impact municipal utility extensions inward toward established urban service boundaries.
The other side
While environmental groups and conservationists view the Accord’s strict standards as non-negotiable protections for water quality and rural character, prospective commercial and infrastructure developers face lengthy entitlement processes, high mitigation costs, and limited site yield compared to non-overlay corridors.
What to watch
- Development proposals submitted to the Big Darby Accord Advisory Panel along the Roberts Road, Alton Darby Creek Road, and Hayden Run Road frontiers.
- How local utility line extensions and substation upgrades interface with Hilliard’s western corporate boundary and the Accord’s defined environmental tiers.
- Potential friction between regional economic development pressures seeking large power capacity and local municipal annexation policies.
The bottom line
The Big Darby Accord remains the defining land-use blueprint for western Franklin County. Any enterprise or development aiming to tap the power infrastructure of western Hilliard must align with two decades of multi-jurisdictional watershed defense.
GoHilliard’s Take
Hilliard sits at a critical junction: we possess the heavy-duty utility assets modern commercial growth demands, yet share direct custody of a regionally vital ecological asset. The key going forward is not choosing between growth and conservation, but holding firm to high-value, low-impact development standards that respect the Accord while capitalizing on the high-voltage corridors flanking Roberts and Alton Darby.
Priyanshu (Pri) Adathakkar, Commercial Real Estate and Hotel Investment Advisor
Disclaimer
This brief is provided for informational and planning purposes only and does not constitute formal legal, land-use, or financial advice. All zoning, environmental overlay boundaries, and development reviews are subject to formal verification with the City of Hilliard, Franklin County, and participating Big Darby Accord jurisdictions.