Maps
Locality Map
Locality map for Nerodia rhombifer (Northern Diamond-backed Watersnake).
Map created 15 April 2026.
County Map
County map for Nerodia rhombifer (Northern Diamond-backed Watersnake).
Map created 15 April 2026.
Historical Locality Map
Historical locality map for Nerodia rhombifer (Northern Diamond-backed Watersnake). Black circles ( 
) represent records after 1986, blue squares ( 
) represent records between 1966 and 1986, orange triangles ( 
) represent records prior to 1966. Note that more recent records might conceal underlying older records.
Map created 15 April 2026.
Historical County Map
Historical county map for Nerodia rhombifer (Northern Diamond-backed Watersnake). Black circles ( ) represent records after 1986, blue squares ( ) represent records between 1966 and 1986, orange triangles ( ) represent records prior to 1966. Note that only the most recent county record for each county is shown.
Map created 15 April 2026.
Ecological Drainage Locality Map
Ecological Drainage Units locality map for Nerodia rhombifer (Northern Diamond-backed Watersnake).
Map created 15 April 2026.
Natural Divisions Locality Map
Natural Divisions and Sections locality map for Nerodia rhombifer (Northern Diamond-backed Watersnake).
Map created 15 April 2026.
Major Watersheds Locality Map
Major Watersheds locality map for Nerodia rhombifer (Northern Diamond-backed Watersnake).
Map created 15 April 2026.
Level I Ecoregion Locality Map
Level I Ecoregion locality map for Nerodia rhombifer (Northern Diamond-backed Watersnake).
Map created 15 April 2026.
Level II Ecoregion Locality Map
Level II Ecoregion locality map for Nerodia rhombifer (Northern Diamond-backed Watersnake).
Map created 15 April 2026.
Level III Ecoregion Locality Map
Level III Ecoregion locality map for Nerodia rhombifer (Northern Diamond-backed Watersnake).
Map created 15 April 2026.
Level IV Ecoregion Locality Map
Level IV Ecoregion locality map for Nerodia rhombifer (Northern Diamond-backed Watersnake).
Map created 15 April 2026.