Gulf Coast Gauges

Caillou Lake (Sister Lake) southwest of Dulac water level

USGS gauge 07381349 · Terrebonne Parish · Houma–Thibodaux · NWS gauge DCLL1

2.29 ft

gage height, Oct 23, 2026 at 2:15 PM CDT · 4 hours ago

Highest since 1992 (USGS)
8.87 ft (July 13, 2019)
Usual range
1.26 to 2.65 ft

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

No National Weather Service alert covering Terrebonne Parish was active when this page was generated (Oct 23, 2026 at 5:50 PM CDT). Alerts are issued and expire at any time; the current list is at alerts.weather.gov.

Last 7 days

0.1 1.4 2.6 Oct 17 Oct 18 Oct 19 Oct 20 Oct 21 Oct 22 Oct 23

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 this gauge's own zero point, which sits at -1.03 ft NAVD88. It is not a water depth and not an elevation: add -1.03 ft to get the water surface elevation.

Daily highs and lows since September 11, 2026

0.1 1.7 3.4 2026-09-11 – 2026-10-23 · bars are daily low to high

Annual peaks since 1992

In 35 complete water years of comparable USGS records (since 1992), the highest peak was 8.87 ft on July 13, 2019. So far in water year 2027 (since October 1) the highest reading is 3.42 ft on October 2, 2026, higher than the annual peak in 14 of 35 years.

2 4 6 8 9 1995 2000 2005 2010 2015 2020 2025 Water year 1992: 2.82 ft on September 17, 1992 Water year 1993: 3.42 ft on October 3, 1992 Water year 1994: 2.92 ft on September 16, 1994 Water year 1995: 3.20 ft on October 27, 1994 Water year 1996: 2.51 ft on August 23, 1996 Water year 1997: 3.69 ft on April 5, 1997 Water year 1998: 3.60 ft on September 11, 1998 Water year 1999: 3.00 ft on March 13, 1999 Water year 2000: 2.89 ft on October 8, 1999 Water year 2001: 3.39 ft on November 6, 2000 Water year 2002: 3.61 ft on October 13, 2001 Water year 2003: 4.37 ft on June 30, 2003 Water year 2004: 3.32 ft on September 23, 2004 Water year 2005: 6.95 ft on September 23, 2005 Water year 2006: 2.64 ft on April 29, 2006 Water year 2007: 3.49 ft on October 16, 2006 Water year 2008: 7.88 ft on September 12, 2008 Water year 2009: 3.41 ft on September 14, 2009 Water year 2010: 3.86 ft on July 7, 2010 Water year 2011: 5.83 ft on September 4, 2011 Water year 2012: 4.54 ft on August 30, 2012 Water year 2013: 3.12 ft on September 21, 2013 Water year 2014: 3.41 ft on June 13, 2014 Water year 2015: 3.14 ft on June 15, 2015 Water year 2016: 4.37 ft on October 25, 2015 Water year 2017: 4.69 ft on April 30, 2017 Water year 2018: 3.50 ft on October 8, 2017 Water year 2019: 8.87 ft on July 13, 2019 Water year 2020: 5.38 ft on August 27, 2020 Water year 2021: 5.25 ft on October 9, 2020 Water year 2022: 3.53 ft on October 27, 2021 Water year 2023: 3.34 ft on December 14, 2022 Water year 2024: 7.53 ft on September 11, 2024 Water year 2025: 4.14 ft on November 10, 2024 Water year 2026: 4.03 ft on July 23, 2026 Water year 2027 so far: 3.42 ft on October 2, 2026 2019 2008 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
September 12, 20087.88 ft—
September 23, 20056.95 ft—
September 4, 20115.83 ft—
August 30, 20124.54 ft—
July 7, 20103.86 ft—
April 30, 20163.55 ft—
October 16, 20063.49 ft—
September 14, 20093.41 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.

Download the readings

caillou-lake-sister-lake-southwest-of-dulac.csv (CSV): every reading stored for this gauge since September 11, 2026, 4,046 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. This site is not affiliated with either agency.