Soil Series Atlas

Soils of Washington

1,770 soil series mapped on 32.25 million acres

050100150cm1 ft2 ft3 ft4 ft5 ftOiOrganic layer · slightly decomposed0–3 cm · 0–1 inOaOrganic layer · highly decomposed3–5 cm · 1–2 inATopsoil5–15 cm · 2–6 inBs1Subsoil · iron and aluminum build-up15–23 cm · 6–9 inBs2Subsoil · iron and aluminum build-up23–43 cm · 9–17 inBs3Subsoil · iron and aluminum build-up43–61 cm · 17–24 inBCSubsoil grading to parent material61–84 cm · 24–33 in2BsmSubsoil · iron and aluminum build-up,cemented, different parent material84–157 cm · 33–62 in050100150cmOiOrganic layer ·slightly decomposed0–3 cm · 0–1 inOaOrganic layer · highlydecomposed3–5 cm · 1–2 inATopsoil5–15 cm · 2–6 inBs1Subsoil · iron andaluminum build-up15–23 cm · 6–9 inBs2Subsoil · iron andaluminum build-up23–43 cm · 9–17 inBs3Subsoil · iron andaluminum build-up43–61 cm · 17–24 inBCSubsoil grading toparent material61–84 cm · 24–33 in2BsmSubsoil · iron andaluminum build-up,cemented, differentparent material84–157 cm · 33–62 in
Tokul, to scale.

Andisols — soils formed in volcanic ash and similar material

The state soil, Tokul, ranks 17th of 1,770 series here on 187,859 acres. First place goes to Ritzville, a Mollisol covering 3.5% of the state’s mapped soil. No order holds a majority; Mollisols lead with 35.3%, ahead of Andisols at 20.3%.

Atlas series mapped in WashingtonGuide: state soils and where series began

Soil orders in Washington

AlabamaArizonaColoradoFloridaGeorgiaIndianaKansasMaineMassachusettsMinnesotaNew JerseyNorth CarolinaNorth DakotaOklahomaPennsylvaniaSouth DakotaTexasWyomingConnecticutMissouriWest VirginiaIllinoisNew MexicoArkansasCaliforniaDelawareDistrict of ColumbiaIowaKentuckyMarylandMichiganMississippiMontanaNew HampshireNew YorkOhioOregonTennesseeUtahVirginiaWashingtonWisconsinNebraskaSouth CarolinaIdahoNevadaVermontLouisianaRhode Island

Largest series in Washington

  1. RitzvilleMollisols · 1,128,689 acres3.50%
  2. ShanoAridisols · 577,292 acres1.79%
  3. AlderwoodInceptisols · 526,615 acres1.63%
  4. QuincyEntisols · 494,333 acres1.53%
  5. Walla WallaMollisols · 489,228 acres1.52%
  6. WardenAridisols · 412,538 acres1.28%
  7. AthenaMollisols · 397,655 acres1.23%
  8. PalouseMollisols · 391,627 acres1.21%
  9. RenslowMollisols · 316,196 acres0.98%
  10. NevineAndisols · 305,247 acres0.95%