Bay & Upper Bay Roads

Sanbornton, New Hampshire

Client: Town of Sanbornton, New Hampshire


  • Bid Administration
  • Construction Administration
  • Construction Observation
  • Cost Estimating
  • Design
  • Drainage Analysis
  • Permitting
  • Utilities Coordination

Project Summary

Hoyle, Tanner was selected by the Town of Sanbornton to provide engineering services for the reconstruction of Bay and Upper Bay Roads. These scenic roads, adjacent to Winnisquam Lake, have experienced major pavement deterioration due to an insufficient roadway box and lack of subsurface drainage. Roadway conditions had become so poor that Steele Hill, the areas major resort destination, had begun to detour traffic around the project area.

The design included pavement reclamation, unsuitable material removal, box reconstruction, and fabric reinforcement to help stabilize the pavement surface. Cut slopes and a high water table necessitated the design of 14,000 linear feet of underdrain to keep the roadway box dry. To convey surface drainage, roadside ditches were improved and additional driveway culverts were added. Multiple drainage culverts were upsized as needed and were given additional cover. Guardrail improvements were also designed to protect steep slopes and other hazards. Durkee Brook winds its way underneath Bay and Upper Bay Roads and two of its crossings were simply dual 36″ R.C. pipes in poor condition. Through discussions with NHDES, Hoyle, Tanner designed two natural bottom culverts consistent with the NH Stream Crossing Rules.

Context sensitive solutions were used to minimize clearing and stone wall disturbance which provided the required improvements while maintaining the historic character of the roadway. Hoyle, Tanner also provided full-time resident engineering services to ensure the project was constructed as designed and to minimize the impact to the local community.

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