All twenty-two have a Manteca page of their own, written from the city's drainage, its levees and its building design criteria. Five run at any hour; the remaining seventeen are scheduled through the request form.
Manteca's stock is young, and much of it postdates the sugar plant. Only 17.7 percent of homes were built before 1970, and about 2,400 more units have been added or permitted since 2020. The Spreckels factory closed in January 1996 after 78 years, its silos came down in 1998, and its 362 acres now hold a retail center, a business park and 166 homes.
The rain season is short, and the drainage has a ceiling. Airport normals give 2.67 inches in January, 2.50 in February and 2.41 in December against nothing in July, so gutters, roof drains and parking fields are cleared in autumn. Runoff goes into South San Joaquin Irrigation District drains and laterals; in January 2024 flows in the French Camp Outlet came within inches of the top of the Louise Avenue culvert, and a high tide in January 2023 left some basins full for close to a week.
The flood history here is a levee history. In January 1997 eleven levees failed between Caswell State Park and Wetherbee Lake, one putting 80 mobile homes under ten feet of water, and the flood covered 70 square miles. The Reclamation District 17 levees still fall short of 200-year protection, the floodplain takes in everything west of Airport Way, and the dry levee is to be raised and extended to Tinnin Road by mid-2029.
Autumn wind is the hazard that catches the drains. A storm in November 2019 cut power to almost 2,400 customers from Main and Louise east to Highway 99, and an abundance of blowing leaves led to localized street flooding. Buildings here are designed to a basic wind speed of 110 mph in risk category II and a rain load of two inches an hour.
Each Manteca service page takes these areas in turn, because the drainage, the ground water and the building type change street by street.
Commercial blocks laid out by the tracks; larger drains went under Center Street in 1989, and the corner still flooded in 2012 and 2014.
Older homes and apartments near downtown, with a surge basin on Moffat Boulevard and infill steadily paving over the open ground.
The former sugar plant site: a retail center, a business park with a 550,000 square foot distribution building, and 166 homes around a pumped basin.
An age-restricted neighborhood of 1,406 homes, the largest built in the city, with residents who stay put while work goes on.
Concrete tilt-up warehousing, a 60,150 square foot laundry and linen plant and logistics tenants on large flat roofs.
More than 3,000 homes approved or in entitlement drain to an outlet that is nearing capacity at the Louise Avenue culvert.
A new neighborhood backing the golf course, where streets flooded in the 3.29-inch four-day storm reported in November 2025.
Three thousand homes with more coming, a water table as high as three feet in places, and approved lots serving as temporary ponds.
A gated lakeside community on the old waterslides site, entered just north of the dry levee that is to be raised.
A 500-room lodge with a 95,000 square foot indoor waterpark, and a city-owned 40-acre sports complex, on 150 acres between two interchanges.
A 2008 lifestyle center on 54 acres with nearly 400,000 square feet of retail, much of its in-line space vacant since it opened.
New arterial commercial south of the bypass: a grocery-anchored center, an approved hotel and the city's largest mini-storage at 818 units.
The emergency trades work to a 90 to 120 minute window around the clock, from a base 18 road miles to the southeast. December and January tule fog and harvest truck traffic push arrival toward the far end of that window. Inside the city the spread runs from downtown out to the entertainment zone on the bypass. Planned work is scheduled once the request has been taken.
Through the City of Manteca Building Safety Division in Development Services, whose applications go through the Accela citizen portal, and the contractor assigned to the request files them. Work in the floodplain and structural repair both bring their own review, The city's own building design criteria, seismic design category D and a 110 mph basic wind speed among them, apply to the drawings.
Each address goes in as its own request, and they all land in the same client area. A hotel on the bypass, a warehouse on Airport Way and a rented house off Sheridan Avenue keep separate scopes, photographs and schedules while a manager sees them together. A single loss that runs from drying into roofing and reconstruction stays on one file.
Five of them: water damage restoration, fire and smoke damage, mold remediation, storm damage and board-up, and biohazard cleanup. Those carry the emergency line and the 90 to 120 minute window. The rest, junk removal, debris hauling, roofing, paving, concrete, construction, remodeling and maintenance among them, are requested on the form and booked as scheduled work.
The Reclamation District 17 levees that protect the Mossdale Tract do not give the 200-year protection state law sets, and the land generally west of Airport Way, with some ground east of it toward Union Road, sits in that floodplain. The fix in place and the raising of the dry levee, with a three-mile extension east to Tinnin Road, is targeted for mid-2029.
