Gulf Coast Gauges

West Fork San Jacinto River above Lake Houston near Porter water level

USGS gauge 08068090 · Montgomery County · San Jacinto River watershed · NWS gauge POET2

56.60 ft

gage height, Oct 20, 2026 at 11:45 AM CDT · 20 minutes ago

Below NWS minor flood stage
24.4 ft
NWS action stage
73.0 ft
NWS minor flood stage
81.0 ft
NWS moderate flood stage
88.5 ft
NWS major flood stage
92.0 ft
Highest since 1985 (USGS)
94.87 ft (August 29, 2017)
Usual range
56.47 to 57.83 ft

USGS marks recent readings as provisional: they can be revised after review.

Active National Weather Service alerts for Harris County

Text as issued by NWS Houston/Galveston.

Last 7 days

56.5 57.1 57.8 Oct 14 Oct 15 Oct 16 Oct 17 Oct 18 Oct 19 Oct 20

Hourly averages of USGS readings. The shaded band is this gauge's usual range: the middle 80% of its readings since September 11, 2026.

How to read this gauge

Gage height is the height of the water surface above the gauge's zero point. This gauge's zero is set at 0 ft NAVD88, so its gage height is the water surface elevation above that datum. It is not a water depth.

The flood stages are the National Weather Service's, on the same scale as the gage height; they are the NWS's references for this location, not estimates made here.

Daily highs and lows since September 11, 2026

56.4 58.7 61.0 2026-09-11 – 2026-10-20 · bars are daily low to high

Annual peaks since 1985

In 41 complete water years of comparable USGS records (since 1985), the highest peak was 94.87 ft on August 29, 2017. So far in water year 2027 (since October 1) the highest reading is 61.04 ft on October 2, 2026, higher than the annual peak in 31 of 41 years.

7 31 54 78 101 1990 2000 2010 2020 major 92 ft moderate 88.5 ft minor 81 ft action 73 ft Water year 1985: 23.89 ft on October 26, 1984 Water year 1986: 26.97 ft on November 26, 1985 Water year 1987: 22.04 ft on June 13, 1987 Water year 1988: 22.26 ft on November 25, 1987 Water year 1989: 29.76 ft on May 18, 1989 Water year 1990: 21.36 ft on May 4, 1990 Water year 1991: 23.59 ft on January 19, 1991 Water year 1992: 24.49 ft on March 5, 1992 Water year 1993: 28.25 ft on June 22, 1993 Water year 1994: 22.62 ft on February 23, 1994 Water year 1995: 40.10 ft on October 18, 1994 Water year 1996: 19.21 ft on December 21, 1995 Water year 1998: 28.41 ft on January 7, 1998 Water year 1999: 38.70 ft on November 14, 1998 Water year 2000: 14.61 ft on May 5, 2000 Water year 2001: 34.43 ft on June 9, 2001 Water year 2002: 23.32 ft on December 12, 2001 Water year 2003: 35.01 ft on November 7, 2002 Water year 2004: 27.72 ft on February 14, 2004 Water year 2005: 22.21 ft on February 8, 2005 Water year 2006: 16.32 ft on October 6, 2005 Water year 2007: 27.92 ft on January 16, 2007 Water year 2008: 29.87 ft on September 14, 2008 Water year 2009: 28.13 ft on April 28, 2009 Water year 2010: 26.07 ft on October 30, 2009 Water year 2011: 13.64 ft on November 3, 2010 Water year 2012: 24.92 ft on July 13, 2012 Water year 2013: 15.52 ft on January 10, 2013 Water year 2014: 22.76 ft on May 28, 2014 Water year 2015: 32.40 ft on May 28, 2015 Water year 2016: 39.33 ft on May 29, 2016 Water year 2017: 94.87 ft on August 29, 2017 Water year 2018: 74.11 ft on March 31, 2018 Water year 2019: 79.76 ft on September 19, 2019 Water year 2020: 65.71 ft on June 25, 2020 Water year 2021: 73.89 ft on May 3, 2021 Water year 2022: 66.50 ft on March 25, 2022 Water year 2023: 75.72 ft on May 16, 2023 Water year 2024: 89.10 ft on May 3, 2024 Water year 2025: 67.34 ft on June 16, 2025 Water year 2026: 68.86 ft on July 14, 2026 Water year 2027 so far: 61.04 ft on October 2, 2026 2017 2024

Each dot is the highest gage height of a water year (October to September), from the USGS annual peak record, with recent years USGS has not published yet taken from its 15-minute readings and this site's own; hover a dot for its date. Dashed lines are NWS flood stages.

NWS historic crests

DateCrestAbove minor flood stage
August 29, 201794.87 ft13.9 ft
May 3, 202489.10 ft8.1 ft

The highest crests the National Weather Service lists for this gauge, as published. They can differ from the USGS annual peaks above: USGS records the year's highest gage height, which is not always the crest the NWS lists for the same flood.

In past storms

StormPeakPeak timeRiseCompared with its record
October 1–2, 202661.04 ftOct 2, 2026 at 12:45 PM CDT4.6 fthighest since water year 2026 (68.86 ft on July 14, 2026)

Harris County gauge nearby

San Jacinto at SH 99, less than 0.1 mi away, read 56.57 ft at Oct 20, 2026 at 11:35 AM CDT, 24.4 ft below its top of bank. Both gauges report water surface elevation.

Download the readings

west-fork-san-jacinto-river-above-lake-houston-near-porter.csv (CSV): every reading stored for this gauge since September 11, 2026, 930 rows, with time in UTC and Central, gage height in feet, and the USGS approval status.

Source. Gage height from the U.S. Geological Survey; flood stages and historic crests from the NWS National Water Prediction Service. This site is not affiliated with either agency.