What Hanna and Dolly Did to Hidalgo County Mobile Homes, and What to Check Now

September 21, 2026

Two hurricanes have reached Hidalgo County in the last twenty years, and a large share of the manufactured homes that rode them out have not had anyone under the skirting since. This post lays out exactly what Dolly in 2008 and Hanna in 2020 did here, using the National Hurricane Center and National Weather Service records rather than memory, what that means for the anchoring and support systems under homes from Mission to Weslaco, and the specific things worth checking now, while it is still a free inspection rather than a $3,000 retrofit.

Where Dolly went

The National Hurricane Center’s report has Dolly making landfall at South Padre Island just after 1800 UTC on July 23, 2008, as a Category 1 hurricane with estimated maximum winds of 75 knots. Insured losses in the United States came to $525 million, which the NHC doubled in the customary way to a rough $1.05 billion total.

By the time the storm reached Hidalgo County it had lost strength but not water. The Weather Service’s wind table for Dolly puts the peak gust at the Weslaco airport at 71 mph with 47 mph sustained, at the Edinburg airport 60 mph with 46 sustained, and at McAllen Miller 52 mph with 35 sustained. Harlingen, one county east, saw 74 mph. Rainfall gauges northwest and northeast of McAllen read 8.59 and 8.53 inches, and a Mission gauge read 8.00.

Where Hanna went

Hanna came ashore twelve years later, on July 25, 2020, along the Padre Island National Seashore on the mid-Kenedy County coast at about 5 PM, carrying sustained 90 mph winds. Again the wind faded inland and the water did not. The Weather Service’s event summary lists gusts of 60 mph at McAllen, 59 at the Weslaco Midvalley airport, and 54 at Edinburg.

The rain is the number that matters for the ground under a home. A gauge 3.5 miles northwest of Mission recorded 14.40 inches. One 2.4 miles northeast of McAllen recorded 12.66. Edinburg recorded 9.78 and the Weslaco airport 6.53. The summary describes “18 inches to up to 4 feet of water” standing in many areas between Santa Rosa and La Feria and east of Edinburg, and in the Mission, La Joya, and Sullivan City area. At least 250,000 customers across the Valley lost power, likely up to half of Hidalgo County. “Hundreds of poorly built homes and other structures were damaged, mainly roofs but also some siding and walls. Dozens of buildings in colonias were uninhabitable.”

Wind Zone I held. The water did the damage.

Hidalgo County is HUD Wind Zone I. The federal standard at 24 CFR 3280.305 lists the Texas counties in Wind Zone II, designed against 100 mph winds, and Cameron and Willacy are the nearest of them; Texas Occupations Code section 1201.256 puts every other county, ours included, in Zone I. Both storms’ inland gusts stayed under Zone II’s design speed, and homes anchored to the state’s Wind Zone I table rode out the wind.

What they did not ride out cleanly was two to four feet of standing water. Three things happen under a manufactured home when the crawl floods for days:

Footings lose bearing. The state’s pier rules in 10 TAC 80.23 size a footing to the soil’s bearing capacity, and the rule on drainage in 80.21(h) says it plainly: water build-up “may cause shifting or settling of the foundation, dampness in the home, damage to siding and bottom board, buckling of walls and floors, delamination of floor decking and problems with the operation of windows and doors.” A 16 by 16 inch footing rated for 2,700 pounds on 1,500 psf soil is sitting on mud after Hanna, and it presses in.

Anchors move. An anchor is rated for the soil it was driven into. Saturated ground holds it differently. After the water drains, the ground around the anchor shaft has been disturbed, and on the shrink-swell clays south of Business 83, Harlingen and Mercedes clay with 60 to 75 and 45 to 60 percent clay, the following dry summer opens cracks along the shaft that leave the anchor holding less soil than before.

Straps go slack. As footings press in and piers drop, the geometry between the frame and the anchor head changes, and a strap that was tight before the storm is loose after it. Slack straps do very little in the next storm, and nobody sees them because the skirting went back on.

The belly takes it too. Standing water against the bottom board soaks insulation, and a torn vapor retarder lets it stay wet. Our water under the home page covers what that looks like from inside.

What to check now

The Texas anchoring standard in 10 TAC 80.24 gives a homeowner a checklist without needing an engineer. With a flashlight from an access panel:

1. End ties. There should be a strap within 24 inches of each end of each I-beam. Missing end ties are the commonest omission on older installs.
2. Spacing. On a 14-wide home with the beam 30 to 40 inches above the anchor head, diagonal ties may be no more than 10 feet apart; on a 16-wide, 12 feet. The full table is on our Texas tie-down requirements page.
3. Tension. Grab each strap. If it moves by hand it is not working.
4. Corrosion. Look where the strap and the anchor head enter the ground. Surface rust is normal. A strap thinned at the soil line is not.
5. Stabilizer plates. The top of the plate should sit within an inch of the anchor shaft. A bare anchor head with no plate is a finding.
6. The soil around the shaft. On clay, a gap opened around the anchor after a dry summer means the clay has pulled off it.
7. The piers. A pier you can rattle by hand is carrying nothing, and its load went to the neighbors.

The 1997 line

One rule in section 1201.256 catches Valley families off guard. A manufactured home built on or after September 1, 1997 to Wind Zone I standards “is not permitted” to be installed in a Wind Zone II county. A home bought new in Hidalgo County after that date cannot be moved to a lot in Harlingen, Brownsville, or anywhere in Cameron or Willacy County. A Zone II home may come the other way without restriction, and a home built before that date may go either way. If a move is in the family’s future, check the data plate before buying the lot.

What it costs to put right

All published on the pricing page, and the tie-down cost calculator prices an anchor job for your home’s size.

When to do it

Hurricane season runs June through November and the McAllen normals put the wettest month in September, at 4.61 inches. The honest window is spring, when the ground is dry enough to probe anchors and drive new ones, and before the water arrives. A home that took Hanna’s water and has not been looked at since is six years overdue. The level check is free, takes about half an hour, and comes back in writing whether or not you hire anyone.