811 and OSHA Rules to Know Before You Dig in Bozeman

Published July 1, 2026

Excavation looks simple from the road: a machine, a hole, a pile of dirt. The parts that keep a Bozeman project safe and legal happen before the first bucket moves. Here is what every property owner and contractor should know about locates, trench safety, and permits before the digging starts.

Call 811 First, Every Time

811 is the free national Call Before You Dig service, and in Montana it takes about two business days for the utilities to come mark the gas, water, electric, and fiber lines on your parcel. It is not optional, and it is not just for big jobs. A fence-post hole can nick a service line as easily as a basement dig. Once the paint and flags are down, you know where the buried lines run and can dig around them with confidence.

Know the OSHA Trench Rule

The single most important safety number in excavation is five feet. Any trench 5 feet deep or greater must have a protective system under OSHA 29 CFR 1926 Subpart P, which means the walls are sloped back, benched in steps, or held by a trench box. Soil is deceptively heavy, and an unprotected wall can collapse without warning. A competent person has to inspect the excavation daily and again after rain, before anyone steps into it.

Get the Permit and Plan Right

Most excavation in Gallatin County needs a permit, and once a site disturbs one acre or more it needs a Stormwater Pollution Prevention Plan (SWPPP) with silt fence and inlet protection. Larger grading jobs also need a stamped grading plan. Sorting this out first prevents a stop-work order later. Our site preparation and grading crew confirms the permit and the plan before we break ground.

Compact It or Regret It

The dig is only half the job; how you put the dirt back matters just as much. Structural fill should go in controlled lifts and be compacted to 95 percent of maximum dry density, verified with a modified Proctor test (ASTM D1557). Loose backfill settles, and settled backfill cracks slabs and sinks trenches. Testing the fill is cheap insurance against an expensive callback.

When to Bring in a Pro

If your job crosses utilities, goes deeper than a few feet, or needs a permit, it is worth having a code-first crew handle it. Cidnola runs 811, protects the trench, tests the fill, and documents the work so the inspection passes. Have a question about your parcel, or need to contact us about a dig? Call Cidnola at (406) 554-4516 for a free walkthrough in Bozeman.