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State Route 99
Fatal crashes 2015–2024 78Deaths 86Counties 5Latest data year 2024
FARS data are based on police crash reports and other sources; the drunk-driving measure is based on the highest BAC of any driver in the crash. Latest data year: 2024. The route is the trafficway recorded for each crash (FARS TWAY_ID); the same route number in another state has its own page.
State Route 99 in Texas was the trafficway in 78 fatal crashes between 2015 and 2024, in which 86 people died.
That is 0.2% of the 35,785 fatal crashes in Texas over the same years. The ten-year crash count rose 271% from 21 in 2005–2014 to 78 in 2015–2024.
The crashes were concentrated in Harris County (49), Fort Bend County (15) and Montgomery County (6) and 2 other counties.
34.6% of the crashes had a driver reported as drinking (Texas: 25.5%) and 30.8% had a speeding-related driver (32.1%); pedestrians were 10.5% and motorcyclists 19.8% of those killed.
Fatal crashes per year
Route identification in FARS is consistent from 2000; earlier years are not shown. Shaded band: the ten-year window used for the shares below.
Compared with all fatal crashes in Texas
| Measure | State Route 99 | Texas |
|---|---|---|
| Fatal crashes, 2015–2024 | 78 | 35,785 |
| Deaths, 2015–2024 | 86 | 39,616 |
| Deaths per fatal crash | 1.1 | 1.1 |
| Share of state fatal crashes | 0.2% | 100% |
| Change vs previous ten years | +271% | +19% |
Factor shares
Counties along the route
| # | County | Fatal crashes on SR-99 | Share of route | County total, all roads |
|---|---|---|---|---|
| 1 | Harris County | 49 | 63% | 4,571 |
| 2 | Fort Bend County | 15 | 19% | 370 |
| 3 | Montgomery County | 6 | 8% | 567 |
| 4 | Chambers County | 4 | 5% | 127 |
| 5 | Liberty County | 4 | 5% | 225 |
Hour of day
Share of fatal crashes on State Route 99 beginning in each hour, 2015–2024; tick marks the Texas share for all roads.
Where along the route
| Mile marker range | Fatal crashes | Share |
|---|---|---|
| Mile 10–15 | 23 | 29% |
| Mile 5–10 | 21 | 27% |
| Mile 0–5 | 17 | 22% |
| Mile 15–20 | 8 | 10% |
| Mile 20–25 | 2 | 3% |
Five-mile bins by FARS milepoint, the six with the most fatal crashes; 91% of crashes on the route have a milepoint. Milepoints are as recorded by the state and can restart at county or district lines.
Other routes in Texas
- Interstate 10 994
- Interstate 35 915
- Interstate 20 852
- Interstate 45 668
- US Route 59 432
- Interstate 30 404
- US Route 90 338
- US Route 287 314
- US Route 281 299
- State Route 6 283
- US Route 69 271
- US Route 84 254
All routes and counties in Texas
Questions and answers
How many fatal crashes have there been on State Route 99 in Texas?
78 fatal crashes with 86 deaths over 2015–2024, per NHTSA's FARS. The route is the trafficway recorded for the crash; the same numbered route in another state has its own page.
Which counties along State Route 99 had the most fatal crashes?
Harris County (49), Fort Bend County (15), Montgomery County (6), Chambers County (4) and Liberty County (4).
What share of crashes on State Route 99 involved alcohol or speeding?
34.6% had a driver reported as drinking and 30.8% a speeding-related driver, against 25.5% and 32.1% for all fatal crashes in Texas.
When do fatal crashes happen on State Route 99?
51.3% of the crashes were between 6pm and 6am. The hour chart on this page shows the full distribution.
Provenance
Source: NHTSA Fatality Analysis Reporting System, annual national CSV files 2000–2024 (accident, vehicle and person tables), public domain. Route pages are built for signed Interstate, US and state routes with at least 20 fatal crashes in 2015–2024. Data through 31 Dec 2024; generated 30 Sep 2026. See methodology and corrections.