Tennessee mammals

North American River Otter in Tennessee

Lontra canadensis

Native to Tennessee S3 Vulnerable in Tennessee

Not listed as nonindigenous in Tennessee by USGS NAS; native to its Tennessee range.

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

LC – Least Concern

Widespread and abundant; not at risk.

North American River Otter in Tennessee, by the numbers

Common in Tennessee 21st most recorded of 86 mammals logged in Tennessee

462 occurrence records
384 with iNaturalist photos
Jul 8, 2026 Last seen in Tennessee

Records from 2000–2026.

462 total records count every Tennessee occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 452 records with a full observation date.

When to look for the North American River Otter in Tennessee

Most sightings fall in October to March.

452 Tennessee occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly Tennessee records (table)
MonthRecords
January58
February50
March44
April21
May17
June30
July28
August29
September24
October56
November52
December43

Monthly north american river otter occurrence records (iNaturalist and GBIF) in Tennessee, 2000–2026.

Seasonality

Year-round in Tennessee, with recorded sightings peaking in October–March.

Occurrence map

Where North American River Otter has been recorded in Tennessee

300 records mapped · zoom and drag to explore

300 Tennessee records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Meeman-Shelby Forest Wildlife Management Area 3
West Sandy Wildlife Management Area 2
Reelfoot Lake 1
Cherokee National Forest 1
Bean Switch Refuge 1

Protected places with the most north american river otter sightings, from the USGS Protected Areas Database plus named mountain ranges, good spots to look, not a full breakdown, so they don't sum to the total.

Where it's recorded in Tennessee

CountyRecords
Rutherford County 52
Blount County 44
Sevier County 40
Sullivan County 34
Haywood County 27
Davidson County 26
Knox County 19
Shelby County 17
Hamilton County 10
Jefferson County 10
Madison County 9
Unicoi County 8
56 other counties 166

The complete county distribution, spread across 68 Tennessee counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Tennessee’s river otter record, 462 sightings, runs along rivers and lakes the length of the state, from the mountain streams of Great Smoky Mountains National Park to the flat water of Reelfoot Lake.

A fisherman in a fur coat

The otter is a water animal with a fisherman’s habits, hunting fish, crayfish, and frogs by touch and sight and denning in bank burrows, root tangles, and old beaver works. It needs clean, fish-bearing water and quiet banks, which is why its Tennessee records follow river corridors and managed wetlands, through places like Cherokee National Forest and the managed lands of Chuck Swan State Forest and Cheatham Wildlife Management Area. Rutherford, Blount, and Sevier counties hold the largest counts.

Most visible when the water is coldest

Otters do not hibernate and keep hunting straight through winter, and Tennessee’s record peaks in January and February and again in October and November. The quietest stretch is April and May, when young otters born in early spring are still held close to the den and the adults that attend them stay near home water.

Status in Tennessee

NatureServe ranks the river otter S3, Vulnerable, in Tennessee. The species is native, but it was trapped out of much of the state by the mid-twentieth century, and reintroductions led by the state wildlife agency beginning in the 1980s helped return it to rivers statewide. USGS NAS does not list it as nonindigenous in Tennessee.

Occurrence data from iNaturalist and GBIF.

North American River Otter in other states

View all states →

More mammals in Tennessee in the atlas

Data & sources

The data and visualizations on this page draw on these open sources:

  • GBIFCC-BY 4.0occurrence records behind the range map, elevation, and record counts
  • iNaturalistCC0 / CC-BY / CC-BY-SAobservations, photos, and audio recordings
  • NatureServe ExplorerCC-BYthe state conservation rank
  • IUCN Red Listattributed factthe global conservation status
  • USGS NASpublic domainnative / introduced status
  • Natural Earthpublic domainthe relief basemap
  • USFSpublic domainnational-forest boundaries
  • USGS Protected Areas Databasepublic domainthe named parks, forests, and refuges behind "notable places to look"