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FEMA flood zones · Texas

Alamo, Texas Flood Zone Map

19,493 residents·in Hidalgo County·4,405 flood claims county-wide

Coastal high risk (V, VE)FloodwayHigh risk (A, AE)Moderate (X, 500-year)Minimal (X)Undetermined (D)

Shaded areas are FEMA’s mapped flood hazard zones in and around Alamo, Texas. Zoomed out they are simplified; at street level the map switches to FEMA’s exact layer. Tap anywhere to check that spot, or search an address above.

Flood risk in Alamo

The map above shows FEMA’s flood zones in and around Alamo; tap any spot, or search an address, for the exact zone. FEMA’s flood insurance records are kept by county, not by city, so the numbers below are for all of Hidalgo County, which includes Alamo.

Less than 1% of Hidalgo County’s area is in FEMA’s high-risk flood zones.

Where the flood claims came from

65% of Hidalgo County’s flood insurance claims were on properties rated outside FEMA’s high-risk zones.

2,747 NFIP claims with a recorded rated flood zone, 1978 to date. The zone is the one FEMA used to rate that policy, which may not match today’s map. Source: OpenFEMA NFIP claims.

How deep the water got

outlet80″ door12″24″36″48″60″72″84″

In Hidalgo County flood insurance claims that reported a flood depth, the average was 5 inches.

Drawn to scale against an 80-inch door. Even a few inches soaks flooring, the bottom of the drywall and anything plugged in near the floor.

Average of the depths reported on the county’s claims (zero and implausible values left out). Source: OpenFEMA NFIP claims.

Flood claims, year by year

The worst year was 2020, with 843 claims and $22.9M paid, the year of Hurricane Hanna.

1978: 5 claims1979: 61 claims1980: 393 claims1981: 33 claims1982: 42 claims1983: 44 claims1984: 7 claims1985: 80 claims1986: 1 claims1987: 10 claims1988: 11 claims1989: 3 claims1990: 4 claims1991: 28 claims1992: 2 claims1993: 2 claims1994: 7 claims1995: 5 claims1996: 4 claims1997: 12 claims1998: 7 claims1999: 13 claims2000: 4 claims2001: 32 claims2002: 23 claims2003: 46 claims2004: 18 claims2005: 12 claims2006: 43 claims2007: 27 claims2008: 352 claims2009: 9 claims2010: 130 claims2011: 7 claims2012: 184 claims2013: 9 claims2014: 34 claims2015: 205 claims2016: 32 claims2017: 4 claims2018: 728 claims2019: 252 claims2020: 843 claims2021: 134 claims2022: 17 claims2023: 13 claims2024: 7 claims2025: 441 claims2026: 25 claims19801990200020102020

Bar height is scaled by square root so ordinary years stay visible next to the worst one. NFIP claims by year of loss. Source: OpenFEMA.

Full Hidalgo County flood history: disasters, storm reports and events →

The zones you’ll see on the map

Cross-section of a river floodplainDiagram: a river valley. The floodway is the channel and the land beside it; the 1%-annual-chance flood surface (the base flood elevation) covers the valley floor as zone A or AE; a narrow band higher up is shaded X, the 0.2% floodplain; higher ground is X.0.2% CHANCE A YEAR (500-YEAR)BASE FLOOD ELEVATION · 1% A YEARXAEFloodwayAEX
  1. A / AE Inside the 1%-a-year floodplain: about a 26% chance of flooding over a 30-year mortgage. AE has a mapped base flood elevation; plain A does not.
  2. Floodway The channel and the land beside it that has to be kept clear enough to carry the flood. Building here is tightly limited.
  3. X shaded The 0.2% (500-year) floodplain, plus some levee-protected and very shallow flood areas.
  4. X Outside both lines. No federal requirement to insure, which is not the same as no risk.

Every flood zone code explained →

Flood insurance in Alamo

If a building is in a high-risk zone (A or V) and its mortgage comes from a federally regulated or insured lender, or is federally backed, flood insurance is required.

The average NFIP premium across Texas was $1,007 a year on August 31, 2026 (premium plus the federal policy fee; the reserve fund assessment and HFIAA surcharge come on top). Risk Rating 2.0 prices each building on its own flood risk, so a quote can be far from the average.

Outside the high-risk zones it is optional, and often worth having: from 2014 to 2024 nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area. Quotes: FloodSmart.gov or a local agent.