North Shore Road over Taylor Brook
North Shore Road over Taylor Brook
Hoyle Tanner prepared a hydrologic and hydraulic study for the replacement of a structurally deficient corrugated metal pipe (CMP) and reinforced concrete pipe.
The existing crossing is comprised of two adjacent culverts. The west culvert is a 4’ diameter reinforced concrete pipe and the east culvert is a 3’ diameter CMP. Due to its deteriorated condition and history of flooding in this area the Town of Derry is investigating replacement options for these culverts.
Hoyle Tanner performed hydrologic and hydraulic analysis and evaluated the existing opening of the culvert and recommended a new culvert type and opening that passes the 50-year flood event with a minimum of 1′ of freeboard per New Hampshire Department of Transportation (NHDOT) requirements. The recommended structure type will be 30’ in span. The project was fully funded through Town funds.
- Hydraulic Analysis
- Study
- Final Design
- Bid Process Administration
- Construction Administration
From the blog
Learn about ongoing projects and the innovative processes we employ for our clients.
Employee Spotlight: Briana Cronin
July 28, 2025
Meet Briana Cronin, Senior Structural Engineer & Coach/Mom3 What drew you to Hoyle Tanner? Being able to work from home and part time. I missed doing engineering work with...
Read More
Engineering Excellence: Stormwater Project Wins Merit Award
July 22, 2025
We are proud to announce that Hoyle Tanner, along with our team members from Sanborn Head and Watershed Consulting Associates, has been honored with a 2025 Merit Award from...
Read More
Rehabilitating the Route 111 Bridges: A Success Story
July 21, 2025
At Hoyle Tanner, we pride ourselves on delivering exceptional engineering solutions, like the recent Route 111 Bridges in Nashua. Stakeholders (Nashua, Hudson and NHDOT) sought to rehabilitate the East...
Read More
Transforming Walnut Oval: A Step Towards Smarter Urban Connectivity
July 14, 2025
The Walnut Oval project in Nashua, New Hampshire, is a significant urban infrastructure initiative aimed at improving traffic flow, pedestrian and bicycle access, and overall connectivity to downtown Nashua....
Read More
Municipal Engineering Division: Water Quality Team Updates
July 7, 2025
If you saw our announcement in January, you know that we restructured our Municipal Engineering Division into three distinct groups: Water Quality, Municipal Facilities & Utilities, and Private Land...
Read More
Enhancing Our Wildlife Services One “Step” at a Time
July 2, 2025
We are excited to announce that Environmental Scientist Joanne Theriault has been certified as a Level 1 Wildlife Tracker according to the standards set by CyberTracker Conservation, enhancing our...
Read More
Employee Spotlight: Connor Boynton
June 27, 2025
Meet Connor Boynton - CADD Designer & Backyard Astronomer What brought you to work at Hoyle Tanner? It was an interesting process. I didn’t come from a designer background...
Read More
The Windy Path of an Engineer: Challenges, Lessons & Triumphs
June 24, 2025
Having graduated from the University of Vermont four years ago, I find myself reflecting on where I was, where I am today, and where I will be in four...
Read More
Stephen Langevin Joins Ground Transportation Division
June 24, 2025
Help us extend a warm welcome to Steve Langevin, PE, who joins us a Senior Structural Engineer (and project manager) in our Ground Transportation Division! Steve is a highly...
Read More