This site will look much better in a browser that supports web standards, but it is accessible to any browser or Internet device.

Washington County, Missouri

Maps

Landmark Map

Landmark locality map for Washington County, Missouri
Landmark locality map for Washington County, Missouri
Map created 15 April 2026.

Interstate HighwayRailroadUS Army Corps of Engineers
US HighwayDepartment of ConservationUS Fish and Wildlife Service
State HighwayDepartment of Natural ResourcesNational Park Service
County HighwayUS Forest ServiceUS Department of Defense

Locator Map

Locator map for Washington County, Missouri
Locator map for Washington County, Missouri
Map created 15 April 2026.

Natural Divisions Locality Map

Natural divisions and sections locality map for Washington County, Missouri
Natural Divisions locality map for Washington County, Missouri
Map created 15 April 2026.

Ecological Drainage Unit Locality Map

Ecological drainage unit locality map for Washington County, Missouri
Ecological Drainage Units locality map for Washington County, Missouri
Map created 15 April 2026.

Major Watersheds Locality Map

Major watersheds locality map for Washington County, Missouri
Major Watersheds locality map for Washington County, Missouri
Map created 15 April 2026.

Major Rivers Locality Map

Major rivers locality map for Washington County, Missouri
Major Rivers locality map for Washington County, Missouri
Map created 15 April 2026.

Level I Ecoregion Locality Map

Level I Ecoregion locality map for Washington County, Missouri
Level I Ecoregion locality map for Washington County, Missouri
Map created 15 April 2026.

Level II Ecoregion Locality Map

Level II Ecoregion locality map for Washington County, Missouri
Level II Ecoregion locality map for Washington County, Missouri
Map created 15 April 2026.

Level III Ecoregion Locality Map

Level III Ecoregion locality map for Washington County, Missouri
Level III Ecoregion locality map for Washington County, Missouri
Map created 15 April 2026.

Level IV Ecoregion Locality Map

Level IV Ecoregion locality map for Washington County, Missouri
Level IV Ecoregion locality map for Washington County, Missouri
Map created 15 April 2026.

Presettlement Prairie Locality Map

Presettlement prairie locality map for Washington County, Missouri
Presettlement Prairie locality map for Washington County, Missouri
Map created 15 April 2026.

Historical Vegetation Map

Historical vegetation map for Washington County, Missouri
Historical Vegetation map for Washington County, Missouri
Map created 15 April 2026.

WaterPrairieBarrens / Scrub
ForestWoodlandOpen Woodland

Geology Locality Map

Geology locality map for Washington County, Missouri
Geology locality map for Washington County, Missouri
Map created 15 April 2026.

AlluviumSandstoneDolomiteLimestone
ClaySandstone / LimestoneDolomite / LimestoneLimestone / Sandstone
IgneousSandstone / DolomiteDolomite / ShaleLimestone / Shale
Limestone / Sandstone / Shale

Species List

Salamanders (Caudata)

Frogs (Anura)

Lizards (Squamata, "Lizards")

Snakes (Squamata, "Snakes")

Turtles (Testudines)

Collection Summary

Washington County has a total of 320 valid, non-duplicated collections representing 56 species and 64 localities. There are a total of 48 collectors and 75 collection dates for the county. This results in a total of 94 expeditions for the county, a measure of unique date / collector(s) combinations. The county's earliest collection year is 1894 and its most recent collection year is 2023. The earliest and latest collection dates (independent of earliest and most recent collection years) are January 5 and October 25, respectively. If you have a new record to report for Washington County, read the New Records section of the FAQ.

Collection Summary by Species

Collection summary for Washington County by species. Some values are unavailable since some records are represented solely by historical literature reports, which sometimes lack complete collecting data. Click on a species or common name to view more information about that species. Click on column headings to sort by that column.
Species Common Name Localities Collections Collectors Dates Expeditions Earliest Year Latest Year
Acris blanchardi Blanchard's Cricket Frog 4 5 5 5 5 1909 1971
Agkistrodon contortrix Eastern Copperhead 4 9 5 5 5 1909 2020
Agkistrodon piscivorus Northern Cottonmouth 1 1 1 1 1 1984 1984
Ambystoma maculatum Spotted Salamander 2 2 2 2 2 1990 2023
Ambystoma opacum Marbled Salamander 3 4 4 3 3 1990 2020
Ambystoma texanum Small-mouthed Salamander 1 1 1 1 1 1942 1942
Anaxyrus americanus American Toad 2 2 2 2 2 1909 1971
Anaxyrus fowleri Fowler's Toad 1 1 1 1 1 1909 1909
Apalone spinifera Northern Spiny Softshell 3 10 3 6 7 1909 1983
Aspidoscelis sexlineatus Prairie Racerunner 2 2 2 2 2 1909 2020
Carphophis vermis Western Wormsnake 6 11 7 7 9 1909 2020
Chelydra serpentina North American Snapping Turtle 5 39 4 5 6 1909 2008
Chrysemys picta Western Painted Turtle 2 3 1 2 2 1976 1976
Coluber constrictor North American Racer 4 8 4 5 6 1909 1966
Crotalus horridus Timber Rattlesnake 2 2 2 2 2 2003 2003
Crotaphytus collaris Eastern Collared Lizard 4 18 7 8 9 1894 1942
Diadophis punctatus Ring-necked Snake 6 14 7 8 11 1953 1972
Eurycea longicauda Long-tailed Salamander 6 12 8 8 9 1906 1965
Eurycea lucifuga Cave Salamander 1 1 1 1 1 1965 1965
Graptemys geographica Northern Map Turtle 3 22 1 4 4 1976 1977
Hemidactylium scutatum Four-toed Salamander 1 1 1 1 1 1988 1988
Heterodon platirhinos Eastern Hog-nosed Snake 2 3 1 2 2 1909 1909
Lampropeltis calligaster Prairie Kingsnake 4 4 4 4 4 1991 2020
Lampropeltis holbrooki Speckled Kingsnake 4 9 6 5 6 1935 2020
Lampropeltis triangulum Eastern Milksnake 3 4 2 3 3 1909 2011
Lithobates catesbeianus North American Bullfrog 1 2 2 2 2 1909 1942
Lithobates clamitans North American Green Frog 3 3 3 2 2 1909 2020
Lithobates palustris Pickerel Frog 2 2 1 2 2 1990 1990
Lithobates sphenocephalus Coastal Plains Leopard Frog 2 4 2 3 3 1909 1990
Masticophis flagellum Eastern Coachwhip 3 3 2 3 3 1909 2014
Necturus maculosus Mudpuppy 1 1 1 1 1 1909 1909
Nerodia sipedon Common Watersnake 2 5 1 2 2 1909 1909
Notophthalmus viridescens Central Newt 1 1 1 1 1 2020 2020
Opheodrys aestivus Northern Rough Greensnake 1 3 2 3 3 1909 1935
Ophisaurus attenuatus Western Slender Glass Lizard 1 1 1 1 1 1989 1989
Pantherophis emoryi Great Plains Ratsnake 2 2 1 2 2 1909 1909
Pantherophis obsoletus Western Ratsnake 1 4 1 2 2 1909 1909
Plestiodon fasciatus Common Five-lined Skink 2 3 3 3 3 1935 1965
Plestiodon laticeps Broad-headed Skink 1 2 1 2 2 1909 1909
Plethodon albagula Western Slimy Salamander 6 12 10 8 11 1909 1971
Plethodon serratus Southern Red-backed Salamander 6 6 7 6 6 1952 2020
Pseudacris crucifer Spring Peeper 2 2 3 2 2 1909 1991
Sceloporus consobrinus Prairie Lizard 7 27 13 7 13 1909 2008
Scincella lateralis Little Brown Skink 8 15 10 8 10 1909 1991
Sistrurus miliarius Western Pygmy Rattlesnake 2 2 2 2 2 1951 1951
Sternotherus odoratus Eastern Musk Turtle 3 4 2 4 4 1909 1983
Storeria dekayi DeKay's Brownsnake 1 2 1 2 2 1953 1953
Storeria occipitomaculata Red-bellied Snake 1 3 1 2 2 1909 1909
Tantilla gracilis Flat-headed Snake 1 1 1 1 1 1965 1965
Terrapene ornata Ornate Box Turtle 1 1 1 1 1
Terrapene triunguis Three-toed Box Turtle 5 6 3 5 5 1909 2005
Thamnophis proximus Orange-striped Ribbonsnake 1 1 1 1 1 1996 1996
Thamnophis sirtalis Common Gartersnake 3 4 5 4 4 1942 1992
Trachemys scripta Red-eared Slider 2 2 2 2 2 1960 1976
Virginia striatula Rough Earthsnake 1 1 2 1 1 2014 2014
Virginia valeriae Western Smooth Earthsnake 1 6 2 3 4 1953 1972

Potential Species Records

Potential species for Washington County. Species are listed in descending order of their likelihood of occurrence within the county. Click on a species or common name to view more information about that species. Click on column headings to sort by that column.
Likelihood Species Common Name Rationale Ecoregion / Watershed
2 Dryophytes versicolor Gray Treefrog Same Level IV ecoregion, within 5 miles Meramec River Hills
2 Graptemys ouachitensis Ouachita Map Turtle Same watershed, within 5 miles Big
2 Graptemys ouachitensis Ouachita Map Turtle Same watershed, within 5 miles Meramec
2 Graptemys pseudogeographica False Map Turtle Same watershed, within 5 miles Meramec
2 Plestiodon anthracinus Southern Coal Skink Same Level IV ecoregion, within 5 miles Meramec River Hills
4 Dryophytes chrysoscelis Cope's Gray Treefrog Same Level IV ecoregion, within 10 miles St. Francois Knobs and Basins
4 Eurycea nerea Northern Grotto Salamander Same Level IV ecoregion, within 10 miles Meramec River Hills
4 Pseudacris feriarum Upland Chorus Frog Same Level IV ecoregion, within 10 miles St. Francois Knobs and Basins
5 Tropidoclonion lineatum Lined Snake Same Level III ecoregion, within 10 miles Ozark Highlands
6 Apalone mutica Midland Smooth Softshell Same watershed, within 20 miles Meramec
6 Apalone mutica Midland Smooth Softshell Same watershed, within 20 miles Big
6 Cryptobranchus alleganiensis Hellbender Same watershed, within 20 miles Meramec
6 Lithobates sylvaticus Wood Frog Same Level IV ecoregion, within 20 miles Meramec River Hills
6 Lithobates sylvaticus Wood Frog Same Level IV ecoregion, within 20 miles St. Francois Knobs and Basins
6 Macrochelys temminckii Western Alligator Snapping Turtle Same watershed, within 20 miles Big
6 Necturus louisianensis Red River Mudpuppy Same Level IV ecoregion, within 20 miles St. Francois Knobs and Basins
6 Pituophis catenifer Bullsnake Same Level IV ecoregion, within 20 miles St. Francois Knobs and Basins
6 Pseudemys concinna Eastern River Cooter Same watershed, within 20 miles Upper St. Francis
7 Ambystoma annulatum Ringed Salamander Same Level III ecoregion, within 20 miles Ozark Highlands
7 Ambystoma tigrinum Eastern Tiger Salamander Same Level III ecoregion, within 20 miles Ozark Highlands
7 Gastrophryne carolinensis Eastern Narrow-mouthed Toad Same Level III ecoregion, within 20 miles Ozark Highlands
7 Lithobates blairi Plains Leopard Frog Same Level III ecoregion, within 20 miles Ozark Highlands
7 Nerodia rhombifer Northern Diamond-backed Watersnake Same Level III ecoregion, within 20 miles Ozark Highlands
7 Pseudacris maculata Boreal Chorus Frog Same Level III ecoregion, within 20 miles Ozark Highlands
8 Regina grahamii Graham's Crawfish Snake Same watershed, within 30 miles Meramec
9 Dryophytes cinereus Green Treefrog Same Level III ecoregion, within 30 miles Ozark Highlands
9 Siren nettingi Western Lesser Siren Same Level III ecoregion, within 30 miles Ozark Highlands
9 Sistrurus catenatus Eastern Massasauga Same Level III ecoregion, within 30 miles Ozark Highlands
9 Thamnophis radix Plains Gartersnake Same Level III ecoregion, within 30 miles Ozark Highlands

Checklist

All MOHAP publications are released in portable document format (PDF), an ISO standard. You must download and install a reader (click icon below) to view these documents. A state checklist, including all counties, is available on the publications page.