Road & Highway Crossings in Greater St. Louis
The standard crossing — 80 to 400 feet, a few conduits, pavement untouched — runs through a two-state machine: the independent city's own full permitting world — Missouri's only county-free city — the municipal quilt of St. Louis County's dozens of incorporated towns, the surrounding counties' departments, and then the DOT pair: MoDOT on the Missouri interstates and spokes, IDOT across the river, each with its own forms, fees, and clocks, run at our desk as one workflow with the right state named per crossing. The interstate ring — 70, 64, 44, 55, 255, 270 — carries junction-grade volume, and both states' One-Call systems mark before anything turns.
The pricing conversation is the banks': Missouri-side crossings carry rock-depth and sinkhole-map awareness, Bottom-side crossings run soft-ground math inside the levee districts' world — named per crossing, because the river between them is a geological border too.
Homeowner candor, network-standard and free: a run through your own open yard is trencher work, and we'll say so before quoting anything. Where public pavement forces the bore, real crossings start at a $10,000 minimum — rig, crew, locates, and traffic control cost what they cost at the Gateway too.
Straight answers
Do you handle both Missouri and Illinois permits?
Both, as one workflow: MoDOT's utility process on the Missouri spines, IDOT's across the river, the independent city's counter downtown, and the county-and-municipal quilt between — each authority's paper named per crossing so a two-state route prices as one project. The rivers draw the metro's borders; they shouldn't draw your schedule's.
What does the sinkhole map mean for an ordinary bore?
Usually a manners note, occasionally a design driver: the Cave State's limestone keeps voids, and the mapped sinkhole plains in parts of the metro earn conservative pressures, monitored returns, and void-aware profiles as standard practice. It's procedural respect rather than drama — and the quote applies it exactly where the karst maps say to.