A single pocket gopher can build up to 200 yards of tunnels underground, moving as much as 2,000 pounds of soil to the surface in a year. These tunnel systems are far more extensive than the scattered mounds on your lawn suggest, with branching networks that include feeding corridors, nesting chambers, and food storage areas all hidden beneath a few inches of dirt.
How Gopher Tunnel Systems Are Built
Gopher tunnels follow a consistent blueprint. The main burrow runs 4 to 18 inches below the surface, roughly parallel to the ground. Branching off this main corridor are lateral tunnels, shorter side passages that angle upward and end at the surface. Each lateral tunnel terminates in either a soil mound (the fan-shaped piles you see on your lawn) or a simple soil plug flush with the ground.
Deeper branches extend off the main run and serve as nesting chambers and food caches. These can reach 5 or 6 feet below the surface, well beyond the reach of most garden tools. A gopher may produce 1 to 3 new mounds per day, sometimes creating as many as 70 in a single month or 200 over a year. Each mound represents a new lateral tunnel the gopher dug to push excavated soil to the surface.
Gophers are solitary animals, so each tunnel system typically belongs to one gopher. That means a single animal is responsible for the entire network of mounds spreading across your yard. When you see mounds clustered in different areas, it often indicates where the main run travels underground, since the laterals branch outward from it.
Gopher Mounds vs. Mole Mounds
The mounds left behind are the easiest way to tell whether you’re dealing with a gopher or a mole. Gopher mounds are crescent-shaped or fan-shaped, with a visible plugged hole on one side. That plug marks where the lateral tunnel met the surface before the gopher sealed it shut. Mole mounds, by contrast, are volcano-shaped with a roughly circular margin and no obvious plug.
If you’re standing over a mound and can identify a flat, horseshoe-like arc of soil with a dirt plug along one edge, you’re looking at gopher work. Mole mounds tend to be more symmetrical and conical, with the soil pushed straight up from below. This distinction matters because gophers and moles require different control strategies.
What Gopher Tunnels Damage
The tunnels themselves cause most of the problems, not just the unsightly mounds. Gophers feed on roots and the fleshy portions of plants they encounter while digging. A single gopher moving along a garden row can destroy an entire planting by pulling plants underground from below. Trees and shrubs suffer too: most girdling damage to trunks and large roots happens belowground where you can’t see it until the plant starts declining.
Beyond plants, gophers gnaw through flexible plastic water lines and drip irrigation tubing. Their tunnels also intercept and redirect irrigation water, carrying it away from where it’s meant to go and causing soil erosion in the process. In some cases, tunnel networks near foundations, retaining walls, or slopes can undermine structural stability as water follows the underground channels rather than draining normally.
Finding the Main Tunnel
Effective control depends on locating the main burrow, not the shallow lateral tunnels that lead to surface mounds. The lateral tunnels are essentially disposal chutes for dirt. The main run is where the gopher spends most of its time and travels repeatedly.
To find it, start at a fresh mound and use a probe (a long screwdriver or dedicated gopher probe works). Push the probe into the soil near the tunnel plug, moving along at 2 to 4 inch intervals. You’ll feel the probe drop suddenly when it hits the void of a tunnel, then stop when it contacts the tunnel floor. Follow the lateral tunnel away from the mound until the probe no longer drops into a void. Return to the last point where you felt the tunnel and probe in a perpendicular direction. When you find a tunnel running at a right angle to the lateral, you’ve located the main burrow, typically 6 to 12 inches deep.
This probing technique is essential for placing traps or bait in the right location. Traps set in lateral tunnels are far less effective because gophers may not revisit those passages. The main run is the highway they use daily.
Trapping in the Main Run
Once you’ve probed and confirmed the main tunnel’s location, dig down to expose it. Clean out any soil that falls into the tunnel opening during excavation, but avoid widening the tunnel itself. Gophers are more likely to investigate a trap that fits snugly in their existing passage.
Place the trap all the way into the tunnel, about half an inch past the vertical edge of the opening you dug. Press it gently downward to stabilize it against the tunnel floor, keeping it parallel to the ground. Stake the trap so it can’t be dragged deeper into the system. If the tunnel is narrower than your trap’s jaws, you can carefully widen it by pushing the set trap in and out a few times. If the tunnel is significantly wider than the trap, open your excavation hole a bit further along the run to find a narrower section.
You can also make a mound set by working directly through the plugged lateral tunnel opening. Probe through the center of the plug to determine the angle the tunnel descends, then excavate along that angle. This approach is faster but places your trap in a lateral rather than the main run, so results can be less consistent.
Wire Mesh Barriers
For raised beds, new lawns, or high-value plantings, a physical barrier is the most reliable long-term solution. Gopher wire is a 3/4 inch hexagonal mesh made from 20 gauge wire, designed to block tunneling without restricting root growth or drainage.
For lawn installation, remove about 1.5 inches of topsoil, lay the mesh flat, then replace 1 to 1.5 inches of soil on top before laying sod or seeding. The mesh sits just below the root zone, creating a floor that gophers can’t dig through. For raised beds and planting holes, line the bottom and sides with the same mesh before filling with soil. The wire eventually corrodes over years, but galvanized versions last long enough to protect plantings through their most vulnerable establishment period.
Wire baskets made from the same mesh can protect individual trees or shrubs. These are placed around the root ball at planting time. The key is ensuring there are no gaps at the seams, since gophers will exploit even small openings once they encounter the barrier underground.