Jack and Bore vs. Directional Drilling: What to Know

Jack and bore uses a hydraulic ram to push steel casing through the soil in a straight line, typically 20 to 200 feet under a road, rail line, or highway crossing. Directional drilling uses a steerable drill head to install pipe or conduit along a curved path from 30 feet up to 5,000 feet or more. Pick jack and bore for short, straight, casing-required crossings, particularly for railroad and DOT permit work. Pick directional drilling for longer runs, curved paths, deeper crossings, or when you need to bore around existing utilities. Trinity Boring Solutions runs both methods across Oklahoma. Call (405) 409-7423 for a method review on your crossing. This guide explains how each method works, what each costs, where each one shines, and how to pick the right one for your crossing in Tulsa, Oklahoma City, or anywhere statewide.

What is jack and bore?

Jack and bore uses a boring machine set in a pit on one side of the crossing. The machine jacks a steel casing pipe forward while a rotating auger inside the casing cuts and pulls back the spoil. The result is a precise, straight, on-grade tunnel, which is exactly what railroads and highway departments want for a casing under their tracks or pavement.

Once the casing is in place, the carrier pipe (water, sewer, gas, or conduit) is installed inside it. Because the path is essentially a straight line driven on grade, jack and bore is the go-to method when a crossing must hold a tight line and slope, such as a gravity sewer under a rail line. The steel casing also gives the carrier pipe long-term protection under heavy loads, which is part of why road and rail owners specify it for crossings under their infrastructure.

One trade-off is that jack and bore is essentially a straight shot. It cannot steer around an obstacle once it is driving, so the path has to be clear and the depth fixed before the casing starts moving. That is fine for a clean road crossing, but it is why longer or more complex runs usually move to directional drilling, where the head can be steered along a planned curve.

What is horizontal directional drilling?

Directional drilling starts with a steerable drill head that bores a pilot hole along a designed path, usually a gentle arc that dips under the obstacle and rises on the far side. The operator tracks and steers the head, then reams the pilot hole to the needed diameter and pulls the product line back through in one continuous run.

The big advantages are flexibility and reach. HDD can curve around known utilities, cross under rivers and wide highways, and run hundreds or thousands of feet between entry and exit points. It is the method most people mean when they say directional boring, and it is the core of what we do. For a full cost picture, see our directional boring cost guide.

Jack and bore vs directional drilling: side by side

The clearest way to choose is to compare the two methods on the factors that actually decide a crossing:

Neither method is universally better. The right call depends on the crossing length, the required grade, the depth, and what the road or rail owner specifies. A contractor that runs both can recommend honestly instead of forcing the job into whatever equipment they happen to own.

Which is cheaper, jack and bore or directional drilling?

Cost depends almost entirely on the crossing. On a short, straight casing under a two-lane road, jack and bore can be very efficient because the machine sets up, drives the casing, and the job is done. There is no long reaming sequence and no extended pull.

On longer or more complex crossings, directional drilling pulls ahead on cost. A single HDD setup can cross several hundred feet, dip under a river, and steer around marked utilities without digging a pit at every point. Trying to force jack and bore into that scenario would mean more pits, more setups, and more cost. The honest answer is that the cheaper method is the one that fits the crossing, which is why we quote each job on its specifics. Our boring cost guide breaks down the variables.

Best method for road and highway crossings in Oklahoma

Oklahoma road and highway crossings come with rules. The Oklahoma Department of Transportation and railroad owners often require an encased crossing with a steel casing pipe at a set depth, which is exactly what jack and bore delivers. For those crossings, jack and bore is frequently the right and sometimes mandated method.

Away from those strict casing requirements, directional drilling usually serves better. A fiber, water, or gas line running down a corridor and crossing several driveways and a creek is a classic HDD job. The takeaway for anyone searching for the best road bore in Tulsa, Oklahoma City, or rural Oklahoma is that the best method is crossing-specific, and you want a contractor who runs both and will tell you which fits. See how boring compares to open-cut work in our boring vs trenching guide.

How does Oklahoma soil affect each method?

The ground decides more than people expect. Across central Oklahoma the red clay and clay loam are stable and predictable, which suits both methods. The trouble starts at the extremes. Loose, running sand can flow into a jack and bore casing faster than the auger removes it, while solid caliche and rock in western Oklahoma wear tooling and slow a directional bore.

This is why a contractor who knows the regional geology can steer you to the right method and a realistic price. The trenchless industry, through groups like the North American Society for Trenchless Technology, emphasizes that ground conditions are a primary driver of both method selection and cost on any crossing. We see the same thing on Oklahoma jobs every week: the dirt sets the rules, and matching the method to the ground is what keeps a crossing on budget and on schedule.

A few Oklahoma-specific patterns we plan around: red clay in the metro bores cleanly for both methods; river-bottom sand favors a well-managed directional bore over jack and bore; and harder western ground means slower progress and a higher per-foot cost regardless of method.

What to ask a boring contractor before you hire

The questions you ask up front tell you a lot about who you are hiring. A crew that only owns one type of equipment will recommend that method for every job, whether it fits or not. Use these questions to find a contractor who scopes honestly:

• Do you run both jack and bore and directional drilling, and which fits my crossing?
• How will you handle the 811 locate and verify the marks before drilling?
• Are you licensed and carrying liability insurance for this work?
• How will you plan the path around marked utilities and any water crossing?
• Does the quote include permits, traffic control, and full restoration?
• Can you provide as-built documentation of the finished crossing?

A contractor who answers these clearly and puts the scope in writing is one you can trust with a crossing. One who dodges them, or whose bid leaves out permits and restoration, is the kind of low bid that turns into change orders later. The same logic applies to any boring job, not just crossings.

How to choose the right method for your project

Run your crossing through a few questions and the right method usually becomes obvious:

1. How long is the crossing? Short and straight leans jack and bore; long leans HDD.
2. Does it need a strict gravity grade? If yes, jack and bore holds line and slope best.
3. Are there utilities or water to cross? Steering around them favors directional drilling.
4. Does the owner require a steel casing? ODOT or rail casing specs often point to jack and bore.
5. How deep must it go? Deeper installs often favor directional drilling.

Trinity Boring Solutions evaluates every crossing on these factors and is available 24 hours a day across Oklahoma. We are based in Yukon and serve the entire Oklahoma City metro and statewide, including the Tulsa area. Before any crossing, we run the 811 locate and plan the path accordingly.