Alligator mississippiensis
Alligator mississippiensis
(American alligator)
Native Transplant

146 results for Alligator mississippiensis (American alligator)
Download Data

Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1695449 ALLimestoneIsolated portions of the Wheeler National Wildlife Refuge, north of the Tennessee River.1979 06030002 Wheeler Lakeunknown
253760 ALMorganDanville, private pond2008 06030002 Wheeler Lakeunknown
253761 AZMaricopaMcCormick Ranch2007 15060106 Lower Saltfailed
115791 AZMaricopaPapago Park ponds, Phoenix1990 15060106 Lower Saltfailed
253762 AZMohaveLake Mead2005 15010005 Lake Meadfailed
156000 CA Colorado River in unspecified county1954 15030104 Imperial Reservoirfailed
262246 CAButteButte Creek, near Chico2009 18020158 Butte Creekfailed
1633409 CACalaverasOff of Calaveritas Road near San Andreas, CA.2019 18040011 Upper Calaveras Californiafailed
271795 CAContra CostaOakley [non-specific location]2007 18040003 San Joaquin Deltafailed
258490 CALakeClear Lake2008 18020116 Upper Cachefailed
164664 CALos AngelesLake Machado, Ken Malloy Harbor Regional Park2005 18070106 San Gabrielfailed
164505 CANapaNapa, CA2005 18050002 San Pablo Bayfailed
1711821 CASacramentoAmerican River at Sailor Bar2023 18020111 Lower Americanfailed
271794 CASolanoSacramento River Delta, Sherman Island area (five miles north of hwy 160 bridge)2007 18020163 Lower Sacramentofailed
271796 COBouldera pond near downtown Longmont2005 10190005 St. Vrainfailed
115877 COBoulderBoulder Country Club1978 10190005 St. Vrainfailed
262080 CODeltaHotchkiss, 4 miles to the northeast next to North Fork Lateral irrigation canal2009 14020004 North Fork Gunnisonfailed
115887 COMesaColorado River near Fruita1991 14010005 Colorado Headwaters-Plateaufailed
281949 DEKentCheswold, retention pond on US Rt 132012 02040207 Broadkill-Smyrnafailed
238700 GAFultonChattahoochee River2007 03130002 Middle Chattahoochee-Lake Hardingunknown
164822 IAPottawattamieCarter Lake2005 10230006 Big Papillion-Mosquitofailed
271797 IDBonnevilleBooneville County2009 17040104 Palisadesfailed
1702471 IDPayetteNew Plymouth, Idaho2022 17050122 Payettefailed
271995 ILCookChicago River, near the Belmont Avenue bridge2010 07120003 Chicagofailed
1548399 ILCookHumboldt Park, Chicago, IL2019 07120003 Chicagofailed

Data Disclaimer: Number of records does not imply species abundance. This summary represent collection records only and may not reflect the actual distribution of established populations. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data.


The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [7/18/2024].

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For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.