What's Under a Saint Paul Street

Trout Brook's storm interceptor once carried sewage and rainwater together. The systems were separated in 1988. The tunnel now carries runoff toward the Mississippi. Its published route is on the map. Capitol Region Watershed District

Saint Paul has separate networks for drinking water, sewage and stormwater. Gas mains and electric cables serve the same buildings. Downtown heating pipes carry hot water that transfers its heat to a building, then returns to the plant.

Before an excavation, the paint identifies the utility: blue for drinking water, green for sewers and drains, orange for communications, red for electricity, and yellow for gas, oil, steam or propane. The map uses muted colors, including blue for stormwater and purple for geology. Gopher State One Call

Saint Paul's drinking water starts in the Mississippi. SPRWS routes source water through lakes before treating it at McCarrons. The plant softens and clarifies the water, filters it through carbon and sand, and disinfects it before distribution. SPRWS treatment process

A water main supplies the street. A smaller service line runs toward each building. SPRWS owns the service from the main to the property line; the property owner owns the section from there to the meter. Some older service lines contain lead. The city's material map records what is known about those pipes; it is not a test of the water coming from a tap. Lead Free SPRWS and address lookup

The map includes 6,441 public hydrant records from the December 2021 snapshot and nine mapped water towers. A hydrant connects to the water network, but its location does not reveal the main's route. Highland Park's historic tower is no longer in water-storage service. Public hydrant inventory Highland Tower

The city's St. Thomas environmental review preserves water, sewer, storm, gas, electric and telecom linework in a May 2023 drawing. Its recovered lines are dashed on this map. The Hillcrest plan also contains existing water and sewer maps. These are dated excerpts; a complete current water-main network is still missing.

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Saint Paul's published traffic-signal inventory includes 1,407 connection lines. It labels 1,297 as fiber and 65 as copper; other records describe radio, low-voltage, overhead, empty or abandoned connections. The map keeps those distinctions. A radio link is not a buried cable. City signal inventory

Optical fiber carries signals as pulses of light. Conduit protects and routes cables. A line labeled empty does not establish that a cable has been installed, and signal fiber does not establish which internet provider serves a house. Data-center and telephone-exchange records provide additional locations within the city.

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Xcel supplies Saint Paul's natural gas. Street mains feed smaller service pipes into buildings, where the gas can be burned for heating or cooking. Published community maps cover only some pipeline routes; their substance tags are retained here. Saint Paul utilities

District Energy Saint Paul sends hot water through underground supply pipes. A heat exchanger transfers its heat to a building's own water circuit. The district water returns through another pipe to be heated again. Wood waste supplies part of the plant's fuel. How district heat works Fuel sources

The district's brochure lists 56 miles of supply and return piping combined, with hot-water supply temperatures of 180 to 250 degrees Fahrenheit. A separate chilled-water system provides cooling. Those pipes carry thermal energy. 2025 plant brochure

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Transmission lines move electricity between generating sites and substations. Transformers change the voltage; the smaller distribution network delivers power to customers. These public records cover transmission, substations and some local lines inside Saint Paul.

The High Bridge plant beside the river generates electricity from natural gas. The map's EIA inventory lists generating units, fuel, nameplate capacity and reported status. Nameplate capacity is a rating, rather than live electrical output. A line without an underground location tag is not shown as a confirmed buried cable. EIA August 2026 inventory

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Storm drains collect rain and snowmelt from streets. Saint Paul reports about 450 miles of storm sewers. Runoff moves toward waterways, sometimes through ponds or other treatment structures, rather than through the sanitary-sewage treatment process. City sewer utility

The Trout Brook system was built between the 1880s and 1950s. Its current six-mile interceptor carries stormwater; Capitol Region Watershed District became its owner and operator in 2006. The map draws the published alignment within Saint Paul. Trout Brook history, map and inspection photographs

Ramsey-Washington's district inventory adds 60 storm-pipe segments inside the city, including Beltline and Battle Creek records. Its structure layer includes intake structures, drop shafts, manholes and outlets; four mapped ponds are available in Map details. Select a record to see its supplied size, material, installation year and notes. Some fields are blank, and unspecified units stay unspecified. District infrastructure inventory

Those are district assets, rather than all of Saint Paul's local drains. DNR buried-watercourse records add separate classifications for culverts, storm sewers and former channels. Their routes can overlap the district inventory without representing an additional pipe.

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Saint Paul maintains about 804 miles of sanitary sewer. Smaller pipes collect wastewater from buildings and feed larger regional interceptors. The map includes 1,203 interceptor records within the city, together with lift stations and flow meters. Former and removed records are available through the inactive-record switch. City sewer utility

The Metro plant near Pig's Eye Lake opened in 1938. It treats wastewater before releasing treated water to the Mississippi. The interceptor map does not include every local branch or trace a building's entire route to the plant. Metropolitan Council

The older combined system carried sewage and runoff in the same pipes. Separating them reduced the amount of rainwater sent toward sewage treatment. The city still cleans and inspects its sewer pipes with cameras to identify obstructions and repairs. Cleaning and televising

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Saint Paul's bluffs expose some of the rock beneath the city. At Waḳaƞ Ṭípi, east of downtown, a cave lies in the sandstone bluff. The National Park Service describes how soft sandstone, flowing water and ceiling collapses may have changed its interior. The cave is not accessible. National Park Service

The map separates bedrock from the glacial and more recent sediment above it. The MGS 2025 depth model estimates the thickness of those deposits. The browser samples the model at about 120 metres, so a colored cell is an estimate across an area. It does not tell you how deep a particular utility was buried. MGS depth model

There are 1,816 located well and borehole records in the Saint Paul extract. They retain reported depths, aquifer codes, status and location methods. Some records describe monitoring or exploration rather than drinking-water wells. A reported bedrock depth can come from a geological interpretation instead of a direct measurement. Minnesota Well Index

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