Miami-Dade County has more utility owners occupying the same ground than almost anywhere else in Florida, and mapping is where that becomes a design problem. A single corridor can carry county water and sewer, municipal systems in cities that run their own utilities, FPL distribution and transmission, gas, multiple telecom and fiber carriers, drainage, and irrigation, each maintaining separate records in separate formats at separate levels of accuracy. Collecting those records produces a stack of drawings that do not agree with one another and cannot be overlaid with confidence. Subsurface utility engineering resolves that by measuring what is actually in the ground and reducing it to one utility model in one coordinate system.
US Utility Potholing provides subsurface utility engineering and utility mapping across Miami-Dade County, including Miami, Hialeah, Doral, Coral Gables, Miami Gardens, and Homestead. We are licensed and insured, and we work for civil engineers, general contractors, municipalities, and electric utility crews. Field data is captured on sub-inch accurate GPS as the crew works rather than scaled from marks after the fact, and it is delivered as a KMZ Google Earth overlay plus CAD and PDF. Electromagnetic induction locating and ground penetrating radar run together on every project, because the utilities each method misses are exactly the ones that show up during excavation.
Utility Mapping Deliverables: KMZ, CAD, and PDF
Every Miami-Dade mapping project produces the same three outputs. The KMZ Google Earth overlay is what gets used first, because anyone on the team can open it without CAD, stand on the site, and see the mapped utilities against aerial imagery. The CAD file drops into the design model as a referenced layer set, separated by utility owner and type. The PDF is what goes into submittals, permit packages, and the project record. All three are generated from the same field-captured GPS data, so they do not disagree with each other. Where a client works primarily in GIS, the same data can be broken out as point and line features with attributes attached, so the mapping does not have to be re-digitized downstream.
Layers are labelled by ASCE 38-02 quality level rather than presented as a single undifferentiated utility plan. QL-D is records research. QL-C is surface feature correlation. QL-B is the designated horizontal position from the geophysical sweep. QL-A is a measured test hole with top-of-pipe elevation, material, and outside diameter. A reviewer, a contractor bidding the work, and a designer setting an alignment each need to know which of those they are looking at, and that distinction is what makes the mapping usable as a basis of design rather than a reference sketch.
Coordinating Records From Multiple Utility Owners
Records research comes first, and in Miami-Dade it means requesting from the county water and sewer utility, the municipal systems in cities that operate their own, FPL, gas, and every telecom carrier with plant in the corridor. Cities such as Hialeah, Coral Gables, Homestead, and Doral vary in how their systems are documented and in how much of the older plant was ever drawn accurately. The point of collecting records is not to trust them; it is to know what to look for in the field and to be able to show which record features the geophysical sweep confirmed and which it did not.
The field sweep is where that reconciliation happens. Where records show a main and the sweep finds nothing, we say so. Where the sweep finds a facility no owner has records for, it goes on the map as an unidentified utility and gets a test hole if the design touches it. Abandoned lines are common in the older parts of Miami and Hialeah, and an abandoned duct bank left in place will still block a proposed alignment even though no owner claims it or maintains a drawing for it. Where an owner disputes what the sweep found, a test hole settles it, and the exposed facility and its measured elevation become part of the record rather than an exchange of opinions.
GIS and As-Built Integration
Because positions are captured on sub-inch accurate GPS in the field, the mapping carries real coordinates and can be handed to a municipal or county GIS without a re-survey step. The same data set supports as-built documentation: test hole locations, exposed facility elevations, and designated alignments are all recorded as points and lines with attributes attached, so a utility owner updating its own system of record has something better than a marked-up plan sheet. For clients maintaining an asset inventory across multiple Miami-Dade projects, that consistency from job to job matters more than any single deliverable.
Mapping Corridors and Interchanges Across the County
The heavily built corridors are where mapping gets tested. The Palmetto Expressway, the Florida Turnpike, US-1, I-95, and I-75 all carry bundled utilities through constrained rights-of-way, and interchange areas accumulate decades of relocations that were recorded inconsistently. Industrial and warehouse districts around Doral and Hialeah add private plant that no one-call ticket will mark: site electric between buildings, fire loops, process lines, and irrigation. Mapping those alongside the public facilities is usually the difference between a plan that reflects the site and one that reflects the record drawings. Campus and institutional properties in Coral Gables and Miami Gardens present the same problem at a smaller scale, with private distribution and mechanical services crossing under paving that record drawings never tracked closely.
Coastal and low-lying areas across the county introduce a limitation worth stating clearly. Ground penetrating radar depth readings drift with the South Florida water table, because the depth calculation depends on how fast the signal moves through the soil and that changes with moisture. Locating gives horizontal position. Depth comes from a test hole. We vacuum excavate with a vac truck, or with air and barrel soft dig where the surface has to stay intact, expose the facility, and measure it. Those measured points are what carry a QL-A label on the map.
Frequently Asked Questions — SUE in Miami-Dade County
What format do you deliver Miami-Dade utility mapping in?
Three formats from one field data set: a KMZ Google Earth overlay, a CAD file, and a PDF. Positions are captured on sub-inch accurate GPS while the crew works, so the CAD and the KMZ carry the same coordinates. Layers are separated by utility owner and type and labelled by ASCE 38-02 quality level, so you can see which lines were designated geophysically and which were verified by test hole.
Can the mapping be used as a basis of design?
Yes, provided each line is read at its stated quality level. QL-B designated alignments are reliable for horizontal position and for identifying conflicts. They are not depth. Where an alignment, a crossing, or a foundation depends on elevation, that utility needs a QL-A test hole, and the measured top-of-pipe elevation goes on the map. We label the mapping that way specifically so designers and reviewers are not guessing at its reliability.
How do you handle utilities that no owner has records for?
They go on the map as unidentified facilities with the geophysical evidence noted, and if the design touches them they get a test hole. Exposing a line tells us material, diameter, and condition, which is often enough to identify the owner or to confirm it is abandoned. In the older parts of Miami and Hialeah this is routine, and an abandoned duct bank left in place will still obstruct a proposed alignment.
Why Work With Us in Miami-Dade County
- Three deliverables, one data set: KMZ Google Earth overlay, CAD, and PDF generated from the same sub-inch accurate GPS captured in the field.
- Labelled by quality level: Miami-Dade mapping separates QL-D records, QL-B designated alignments, and QL-A measured test holes so nothing reads as more certain than it is.
- Multi-owner coordination: Records requested and reconciled across county water and sewer, municipal systems, FPL, gas, and the telecom carriers in the corridor.
- GIS-ready coordinates: Field-captured positions hand off to county or municipal GIS and as-built records without a separate survey step.
- Depth from test holes only: GPR depth readings drift with the South Florida water table, so elevations come from vacuum-excavated QL-A holes.
Related: how SUE works · utility mapping deliverables · QL-A test holes · Miami-Dade County coverage