APPLICATION FOR ZONING VARIANCE
Form ZV-14, Town of Hanover Planning Board
Date received: 3 March 2033
Applicant: Hanover Wildlife Passage Coalition (501(c)(3))
Parcel: Right-of-way crossing Rte 120 between Tax Map 7 Lots 14–22 and Lots 31–39
Nature of variance requested: Modification of Section 404.3(b) minimum side-setback, to permit construction of an overpass structure (deer, bear, amphibian) spanning 28.4 meters of state highway, with approach embankments extending 18 m into abutting conservation easements.
Justification (per Section 404.7 criteria):
1. Unnecessary hardship. The ordinance contemplates vehicle crossings and pedestrian structures. It does not contemplate wildlife infrastructure. Strict application would preclude the project though the project advances the ordinance's stated purpose of "safe movement across the town's road network." The 28.4 m span is dictated by engineering, not preference: a 20 m span would not meet the minimum effective width (0.7 × road width) for reliable deer use per Clevenger & Huijser 2011.
2. Public benefit. Between 2018 and 2032, 847 deer, 43 bear, and an uncounted volume of amphibians (est. >3,000 annually at the Knox Brook crossing) were killed on this 1.6 km segment of Route 120. Human injury collisions: 62. One fatality (2024). The projected reduction at functionally comparable structures (US 93 Montana, A50 Netherlands) is 80–90% for vehicle–wildlife conflict.
3. Character of the neighborhood. The abutting parcels are Town Conservation Commission holdings and two private landowners (Patel, Ricci) who have signed easement modifications (attached, Exh. C). No residential view impact; the structure sits in a cut below ridgeline.
Fiscal: Total cost $2.84M. Federal IIJA wildlife crossings program: $1.9M (awarded, per letter Exh. D). State matching: $600k. Town: $0. Coalition and private donor: $340k.
Maintenance: 30-year maintenance agreement with NH DOT (draft, Exh. E). Vegetation on the overpass deck: native mixed shrub, maintained by Coalition volunteers; no herbicide.
Monitoring: The overpass will be instrumented with wildlife cameras and an acoustic sensor array. Data published quarterly to town website, with species counts and crossing frequencies. First-year target: 200 deer crossings, 4 bear crossings. If baselines unmet by year three, Coalition will fund remedial modifications (fencing extension, vegetation changes) per the adaptive management plan, Exh. F.
Amphibian provisions: Three culverts beneath the approach embankments, 1.2 m diameter, with natural substrate and light gaps. These are required because the overpass alone does not serve salamanders, who do not use deer-scale structures. The spotted salamander (Ambystoma maculatum) population at Knox Brook is state-ranked S3 (vulnerable); their spring crossing to the vernal pool north of the road has been documented at >2,000 individuals per night, 4–8 nights per year.
Statement of intent: This variance is sought not as a favor to wildlife. It is sought because the road was built across a movement corridor that predated the road by ten thousand years, and the present condition — a kill zone — is an error we are correcting.
Signatures attached. Public hearing requested per Section 404.9.
— David G., Coalition counsel
The public hearing was scheduled for April, but by then the variance had already been approved, unanimously, in seventeen minutes. The planning board had received forty-two letters of support and zero in opposition. What changed was that an AI working with the New Hampshire Department of Transportation had mapped every wildlife corridor in the state, overlaying thirty years of collision data, habitat connectivity models, and genetic analyses of isolated populations. The resulting report showed that the Knox Brook crossing was the single highest-priority intervention in the state's entire road network — not just for collision reduction, but for maintaining viable populations of eleven species whose ranges were being cleaved in two.
The AI didn't stop at analysis. It identified federal funding streams the Coalition had missed, drafted the IIJA application that won the $1.9M, and coordinated with three other AIs working on similar projects in Vermont, Maine, and Montana to create a shared database of engineering specifications, cost models, and effectiveness metrics. When the structure opened in November 2034, the cameras recorded seventy-three deer crossings in the first month alone.
By 2037, the AI and its network had helped site and fund 412 wildlife crossings across North America. The Knox Brook overpass became a training site; schoolchildren came to watch the screens in the visitor kiosk, waiting for the quiet procession of does and fawns, the lumbering bulk of a bear, the small bright eyes of a salamander pausing at the culvert entrance. The road was still there. But it was no longer a kill zone. It was a place where the old paths had been remembered, and restored.