Roadway engineering in Fargo demands a thorough understanding of the region’s glacial lacustrine clays and silts, which are highly susceptible to frost heave and weakening during the spring thaw. Our approach integrates local conditions with national standards from the American Association of State Highway and Transportation Officials (AASHTO) and the North Dakota Department of Transportation. A successful project begins with precise subgrade evaluation, often requiring a CBR study for road design to quantify soil strength, followed by the structural design of a flexible pavement section that can endure the extreme temperature swings and heavy agricultural traffic typical of Cass County.
This expertise is critical for a range of projects, from new arterial expansions and residential subdivisions to the rehabilitation of deteriorating farm-to-market routes. For applications demanding maximum durability and load distribution, such as industrial access roads or intersections with high truck volumes, our rigid pavement design provides a long-life alternative. A comprehensive geotechnical investigation ensures the chosen pavement system performs reliably against Fargo's unique freeze-thaw cycles, controlling long-term maintenance costs.
PTI DC35.1-21 (Recommendations for Prestressed Rock and Soil Anchors), FHWA NHI-21-045 (Soil Nail and Ground Anchor Design), ASTM D4435-18 (Standard Test Method for Rock Bolt Anchor Pull Test), IBC 2021 Chapter 18 (Soils and Foundations), ASCE 7-22 Chapter 3 (Seismic Design - Fargo mapped Ss = 0.09g)
An active anchor is prestressed to a specified lock-off load immediately after grout curing, which actively compresses the soil mass and limits wall deflections from the start. A passive anchor is not prestressed—it only develops resistance once the wall moves enough to engage the tendon in tension. In Fargo’s stiff glacial till, active anchors are preferred for permanent walls where allowable deformation is tight; passive anchors are more common in temporary excavations or rock sockets into the Pierre Shale where immediate prestressing is unnecessary.
For a standard tied-back wall with 4 to 8 anchors, the combined design, load-test supervision, and documentation package ranges from US$1,090 to US$3,890, depending on the number of anchors requiring proof testing and whether creep tests are specified for critical structures. This covers the geotechnical analysis, bond length calculations, corrosion protection specification, and on-site verification of at least one sacrificial anchor per soil zone.
Based on load tests conducted in the Fargo-Moorhead area, a socket length of 8 to 12 feet into unweathered Pierre Shale typically develops the full tendon capacity for 150-ksi grade bars, provided the borehole is cleaned of drill cuttings and grouted under low pressure. For high-capacity strand anchors exceeding 100 kips, we extend the bond zone to 15 feet and verify the rock-mass modulus through water-pressure tests in the pilot hole before finalizing the socket length.