|viewed from a point near Uncertain|
|Basin countries||United States|
|Surface area||25,400 acres (10,300 ha)|
|Surface elevation||161 ft (49 m)|
|Designated:||October 23, 1993|
Caddo Lake (French: Lac Caddo) is a 25,400 acres (10,300 ha) lake and wetland located on the border between Texas and Louisiana, in northern Harrison County and southern Marion County in Texas and western Caddo Parish in Louisiana. The lake is named after the Southeastern culture of Native Americans called Caddoans or Caddo, who lived in the area until their expulsion in the 19th century. It is an internationally protected wetland under the RAMSAR treaty and features the largest Cypress forest in the world. Caddo is one of Texas' few non-oxbow natural lakes and is the 2nd largest in the South; however, it was artificially altered by the addition of a dam in the 1900s.
According to Caddo legend, the lake was formed by the 1812 New Madrid Earthquake. There may be some truth to the legend, as Reelfoot Lake in Tennessee was formed by that earthquake, but most geologists now feel that Caddo Lake was formed gradually rather than catastrophically. The lake was formed, either gradually or catastrophically, by the "Great Raft," a 100-mile (160-km) log jam on the Red River in Louisiana, possibly filling the basin that the intense uplift and shifting of the earthquake had created.
Caddo was first seen by Native Americans in the 18th century, but substantial development would only begin with invention of the steamboat and US annexation of both Louisiana and Texas in the 19th century. The cities of Port Caddo, Swanson's Landing, and Jefferson in Texas, and Mooringsport in Louisiana, had thriving riverboat ports on the lake. Gradually as the log jams were removed in the lake and the Red River by Captain Henry Miller Shreve and then by the Army Corps of Engineers, the lake changed shape and eventually fell over ten feet, destroying the East Texas ports and their riverboat industry.
Industry once again came to Caddo Lake with the discovery of oil beneath it. The world's first over water oil platform was completed in Caddo Lake in 1911. The Ferry Lake No. 1 was erected by Gulf Refining Company. The well bottomed at 2,185 feet (666 m) and produced 450 barrels per day (72 m3/d).
Oil derricks sprang up throughout the lake, around the turn of the 20th century, further damaging the fragile ecosystem. The oil industry left Caddo for richer fields at Kilgore and other locations in Texas. Texas tried to preserve parts of Caddo in 1934 by establishing a State Park, constructed by the WPA. The establishment of the Longhorn Army Ammunition Plant on the shores of Caddo, in the mid 20th century, polluted large portions of the surrounding wetlands until its closure in the 1990s.
An ecologist named Lionel Janes conducted a survey of Caddo Lake (called Ferry Lake at the time) in 1913 and 1914. Based on an examination of cross sections of baldcypress and hardwood trees and many dead stumps he estimated that the lake came into existence sometime between 1770 and 1780.
Preservation efforts 
In 1993 Caddo Lake preservation entered a renaissance, with the announcement that 7,000 acres (28 km²) of Caddo purchased by the Nature Conservancy were to be merged with the 483 acre (2 km²) Texas Caddo Lake State Park to be become the Caddo Lake State Park and Wildlife Management Area. As a result of efforts by the Caddo Lake Institute (co-founded by Don Henley and Dwight K. Shellman), in October 1993 Caddo Lake became one of thirteen areas in the United States protected by the Ramsar Convention. As of 2003 Caddo Lake flora and fauna consisted of: 189 species of trees and shrubs, 75 grasses, 42 woody vines, 216 kinds of birds, 90 fish and reptiles, and 47 mammals. One of these species, Crataegus opaca or mayhaw fruit, is collected from the water to make a jelly that is considered one of the finest in the world. Forty-four of Caddo's native species were either endangered, threatened or rare. From 2001 until 2003 Caddo Lake residents fought a legal battle with the City of Marshall, Texas over water rights.
Voices advocating preservation of Caddo Lake included rocker Don Henley, frontman for The Eagles.
Current threat 
The lake is currently "under siege" by a fast-spreading, Velcro-like aquatic fern, Salvinia molesta, also known as Giant Salvinia. Accidentally introduced to the lake by boaters, the noxious weed doubles in size every two to four days, rapidly killing off life below the surface. Most of the growth of the plant is currently on the Louisiana side, where officials have been focused on recovering from damage caused by Hurricanes Katrina and Rita in 2005.
Efforts at removing the weed have included biological means via beetles that normally eat the weed but cannot survive the Texas cold and now include herbicide. The Texas Water Resource Institute's Caddo Lake Salvinia Eradication Project is evaluating multiple methods of eradication. See TWRI's website for details.
Texas Bigfoot 
Cities and towns on Caddo lake 
- Jefferson, Texas
- Karnack, Texas
- Mooringsport, Louisiana
- Oil City, Louisiana
- Swansons Landing, Texas
- Uncertain, Texas
See also 
- TPWD: Caddo Lake State Park
- The first 'over water' oil well
- Janes, Lionel. 1914. Examination of Ferry (Caddo) Lake. Volume II. U.S. Department of the Interior. 187 pages.
- In pictures: The week in wildlife | Environment | guardian.co.uk
- In East Texas, Residents Take On a Lake-EatingMonster - New York Times
- Caddo Lake Salvinia Eradication | Center for Invasive Species Eradication
- Bagur, Jacques D. 2001. A History of Navigation on Cypress Bayou and the Lakes. The University of North Texas Press, Denton, TX
- Keeland, B.D. and P.J. Young. 1997. Long-term growth trends of baldcypress (Taxodium distichum (L.) Rich.) at Caddo Lake, Texas. Wetlands 17(4): 559/566.
- King, S.L., B.D. Keeland, and J.L. Moore.Beaver lodge distributions and damage assessments in a forested wetland ecosystem in the southern United States. Forest Ecology and Management 108(1-2).
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