Construction Doesn’t Stop for Winter
In Colorado, the construction season doesn’t end just because the temperature drops. From emergency utility repairs to massive commercial developments pushing to meet deadlines, excavation continues year-round.
However, winter weather introduces a host of severe challenges for excavation crews. When the ground freezes solid (the frost line in Colorado can reach 36 inches or deeper), hand-digging and safe “potholing” become nearly impossible. Contractors are forced to rely heavily on heavy mechanical excavators, which drastically increases the risk of a catastrophic utility strike.
Because safe excavation is harder in the winter, accurate utility locating is more critical than ever. But a common question we get at JLP Tech is: Does locating technology even work in the snow and ice?
Can Ground Penetrating Radar (GPR) See Through Snow?
The short answer is: Yes, absolutely.
Ground Penetrating Radar (GPR) works by transmitting high-frequency radio waves into the ground and recording the echoes that bounce back from subsurface objects.
Interestingly, pure ice and dry snow are highly transparent to GPR radar waves. Because frozen water has a very low electrical conductivity, radar signals pass right through it with minimal interference. In fact, if the ground is frozen solid, GPR can sometimes achieve deeper penetration than in the spring, when the soil is saturated with conductive liquid water.
The Catch: Slush and Salt While dry snow and ice are fine, GPR does struggle with highly conductive materials. If a concrete slab or roadway is covered in melting slush mixed with heavy road salt (magnesium chloride), the salty water acts as a conductive shield, scattering the radar waves before they can penetrate the surface. In these cases, the surface needs to be cleared before scanning.
How Winter Affects Electromagnetic (EM) Locating
While GPR handles frozen ground beautifully, traditional Electromagnetic (EM) locating—which is used to trace metal pipes and energized cables—requires a bit more winter prep.
EM locators require a strong electrical circuit to function. In the summer, technicians often stick a grounding rod directly into the dirt to complete this circuit. In the winter:
- The Grounding Challenge: Driving a copper rod into a foot of solid frozen earth is incredibly difficult.
- The Solution: Expert locators carry specialized equipment, such as heavy-duty drills to penetrate the frost layer or specialized grounding mats, to ensure a strong signal is established regardless of the temperature.
- Access to Connections: EM locating often requires directly clamping onto a utility at a meter or valve box. If these access points are buried under three feet of plowed snow, they must be shoveled out before the locate can begin.
Why Winter Locating is Non-Negotiable
When the ground is frozen, contractors lose the “feel” of the dirt. In the summer, an experienced excavator operator can often feel a change in soil resistance before tearing through a PVC pipe. In the winter, ripping through frozen earth requires maximum hydraulic force. If an excavator bucket hits a hidden gas line or electrical conduit under those conditions, it will shred it instantly.
Dig Safely Year-Round with JLP Tech
Winter excavation in the Denver metro area and throughout the Front Range is tough, but it shouldn’t be a guessing game.
At JLP Tech, our certified technicians are trained to overcome the unique environmental challenges of Colorado winters. Whether we are utilizing GPR over a frozen construction site or tracing electrical lines through a snow-covered commercial campus, we ensure you have the precise data you need to dig safely in any season.