Preview: automated baseline. Built automatically from federal data and not yet checked by hand. Check every figure against your own records before you use it in a plan.

Montgomery County, TX

Risk-assessment baseline packet. County area 48339. Release 2026-10, data as of 2026-09-28.

Download the packet

PDF: PDF, for printing and reading. Word: Word document, tables ready to paste into a plan. Excel: Excel workbook, one sheet per section, full tables. JSON: Packet data (JSON), for analysts. Full packet as a web page. File manifest (checksums, source versions).

Plan clock

Approved, expires 2029-05-01

Plan
Montgomery County (FEMA plan 109183)
Approved
2024-05-02
Expires
2029-05-01
As of
2026-09-28
Days
946 days to expiry

Map group: Covered beyond 24 months.

What changed since your last plan (approved 2024-05-02)

New federal declarations
DR-4781-TX, DR-4798-TX, FM-5573-TX (3 declaration rows; 3 counted incidents)
Storm Events records since approval
31 (data through 2026-06-30)
Repetitive loss now
FMA RL 652, SRL 641 (44 CFR 77.2); any definition: 1,995
Repeat-flood change
First release: no prior release to compare.

Plan status for every jurisdiction in the plan

18 jurisdictions. Each row is that jurisdiction's own plan clock. Notes include other approved plans FEMA lists for the same jurisdiction.

JurisdictionTypeStatusPlanApprovedExpiresDays to expirynegative = days since expiryUpdate underwayNotes
Montgomery CountyCountyApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Conroe cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Cut and Shoot cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Houston cityCityApproved, expires 2028-11-15Houston (FEMA plan 108932)2023-11-162028-11-15779
Magnolia cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Montgomery cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Oak Ridge North cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Panorama Village cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Patton Village cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Roman Forest cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Shenandoah cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Splendora cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Stagecoach townTownApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
The Woodlands CDPUnincorporatedApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Willis cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Woodbranch cityCityApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
Woodloch townTownApproved, expires 2029-05-01Montgomery County (FEMA plan 109183)2024-05-022029-05-01946
San Jacinto River AuthorityFlood Control DistrictApproved, expires 2030-04-08Waller County (FEMA plan 110285)2025-04-092030-04-081,288

State plan status and tribal plans in this state: see the state page.

What the packet contains

Sections in FEMA checklist order. Each heading names the review item its tables support; whether the item is satisfied is decided by the plan and its reviewers. Full tables are in the downloads above.

Supports B1-a Hazards

14 of the 18 National Risk Index hazards apply here; omission evidence is shown only where NRI rates a hazard "Not Applicable", no federal declaration names it and Storm Events has no record of it since 1996.

Highest expected annual loss (NRI, modeled): Inland Flooding, Tornado and Cold Wave.

Also check locally (not covered by NRI): dam failure (incl. upstream dams), levee failure, flash flood as its own subtype, ice jams, debris flows, erosion (riverine and coastal), land subsidence and sinkholes and expansive soils.

Check your state hazard mitigation plan's hazard list for this county; explain any hazard you drop.

Supports B1-b Location

  • Avalanche, Coastal Flooding, Earthquake, Hurricane, Landslide, Tornado, Tsunami, Volcanic Activity and Wildfire: Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet.
  • Cold Wave, Drought, Hail, Heat Wave, Ice Storm, Lightning, Strong Wind and Winter Weather: Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally.
  • Inland Flooding: The FEMA Flood Insurance Rate Map (FIRM) is the required location source for flooding. See the FEMA Flood Map Service Center (https://msc.fema.gov) for this county.

Supports B1-c Extent

Storm Events records for 12 of 20 hazard groups, with the scale, observed range and worst recorded event for each; the others say local data required.

  • Hail: 4.75 in hail, 2004-04-10
  • Thunderstorm Wind: 87 kt (100 mph), measurement type not recorded, Thunderstorm Wind, 1983-05-20
  • Tornado: EF3 tornado, 2024-12-28, 10.34 mi within this county, 1,675 yd wide, $0 property; $0 crops (2024 dollars), 10 direct injuries

Supports B1-d Previous occurrences

39 federal declaration rows for this area (29 counted incidents), each with type, dates and county Public Assistance dollars.

New since the last plan (approved 2024-05-02): FM-5573-TX, DR-4798-TX and DR-4781-TX.

10 statewide declarations listed separately.

Hazards with no recorded events are stated as such (5 of 18).

Storm Events history: 613 records (notable ones in the PDF, all of them in the Excel file).

Supports B1-e Probability

FEMA annualized frequency (modeled) for each hazard, with a descriptor from a scale defined in the packet.

  • Highly likely: Hail, Lightning and Strong Wind
  • Likely: Drought, Heat Wave, Hurricane, Ice Storm, Inland Flooding, Landslide, Tornado and Winter Weather
  • Possible: Cold Wave

Historical frequency by intensity band (tornado, hail, wind): 9 bands from Storm Events.

Supports B1-f Variation across the planning area

Range of census tract risk scores within the area for 18 hazards (133 tracts; rated tracts only).

17 member jurisdictions: plan clock, repeat-flood count, Public Assistance dollars and event records naming the place (starter, confirm locally).

Supports B2-a, B2-b Assets and impacts

Local data required

County-level starter. The plan must describe impacts for each participant and its own assets.

Storm Events damage since 2024-05-02: $72,000 in county-coded records (28 records); $0 reported for the zone (3 zone records). Data through 2026-06-30; nominal dollars.

Checklist of what to gather locally: Critical facilities and lifelines per hazard; A problem statement per participant per hazard; Changes in development in hazard-prone areas since the last approval, or a statement of none (E1-a); Future assets.

  • Texas A&M Forest Service TxWRAP for wildfire risk; Texas State Hazard Mitigation Plan hazard list for B1-a exclusions.

Supports B2-a Context

Population 620,016; building value $107,575,642,372 and agriculture value $33,168,663 (total, not at risk).

National Risk Index rating Relatively High; social vulnerability Relatively Low; community resilience Relatively Low.

Supports B2-c Repetitive loss

Repetitive-loss properties, FMA definition (44 CFR 77.2): 652 repetitive loss, 641 severe repetitive loss. NFIP insurance definition: 1,855 and 509.

Mitigated 102; insured 738; NFIP data as of 2026-08-02. Counts by occupancy and for each member community are in the packet.

Releases

Monthly releases are planned (not yet running); files for a release never change. Earlier releases will be listed here with what changed between them. All releases.

Cite this

Hazard Plain (2026). Montgomery County, TX: risk-assessment baseline packet, release 2026-10 (data as of 2026-09-28; County area 48339). Preview: automated baseline. https://hazardplain.org/tx/48339/ Built from FEMA OpenFEMA, the FEMA National Risk Index and NOAA NCEI Storm Events; source versions in the packet's Sources list.

Source citations for the plan's bibliography (8)

How this packet is built, its sources and its limits