Road widening project shores up steep slope, mitigates erosion concerns

Dec. 7, 2017

The widening of a road around the south end of popular Lake Winnipesaukee in Alton Bay, N.H., created a steep slope (1H:1V) adjacent to the roadway. Concern that potential erosion and washout would occur during heavy rain events made stabilization of the 52-ft slope necessary.

Project objectives

Cost and aesthetics were major considerations for this project. Determining who would do the design work and installation were other issues for Ken Roberts, town road agent for Alton, to consider as he evaluated options. After reviewing a block retaining wall and Presto’s Geoweb slope system, the decision to use the Geoweb system was based on cost savings and design and installation support.

Design & construction

Local distributor E.J. Prescott worked with Presto’s design team to create a detail and specification. E.J. Prescott’s local contact Mike Everhart supported the contractor with installation training. The town’s highway department completed the installation. The 10,000-sq-ft slope project was installed in just a few days. The Geoweb cells were filled with topsoil and hydroseeded to ensure full grass coverage. Within four weeks, the slope was fully vegetated with dense, stabilizing grass.

The results

Before it was fully vegetated, the slope was exposed to multiple storm events with no damage or infill loss. “The Geoweb system held the material in place beyond expectations,” Everhart said. “Ken and his crew at the town of Alton highway department did a fantastic job on this project.”

Sponsored Recommendations

The Science Behind Sustainable Concrete Sealing Solutions

Extend the lifespan and durability of any concrete. PoreShield is a USDA BioPreferred product and is approved for residential, commercial, and industrial use. It works great above...

Powerful Concrete Protection For ANY Application

PoreShield protects concrete surfaces from water, deicing salts, oil and grease stains, and weather extremes. It's just as effective on major interstates as it is on backyard ...

Concrete Protection That’s Easy on the Environment and Tough to Beat

PoreShield's concrete penetration capabilities go just as deep as our American roots. PoreShield is a plant-based, eco-friendly alternative to solvent-based concrete sealers.

Proven Concrete Protection That’s Safe & Sustainable

Real-life DOT field tests and university researchers have found that PoreShieldTM lasts for 10+ years and extends the life of concrete.