Oridia
silt loam

Mapping Symbols: Os

The Oridia series consists of somewhat poorly drained soils that formed in alluvium in river valleys. Slopes are less than 2%. The
annual precipitation is 35 to 55 inches. The frost-free season is about 200 days.

Typical Profile:
Depth from Surface:
0 to 60 Inches: Grayish brown silt loam 

Permeability: Moderate to moderately slow in the subsoil

Rooting Depth: 60 inches or more if drained

Depth to Seasonal High Water Table: 1 to 2 feet

Available Water Holding Capacity: High

Runoff Potential: Slow 

Erosion and Slippage Hazard: Slight

Flooding Potential: Moderate

Use and Management: Primary uses of this soil are for row crops, pasture, and urban development. Pasture forage yields are 3.0 tons/acre/year if undrained and 5.0 tons/acre/year if drained. Douglas-fir, Western Hemlock, Red Alder, Bigleaf Maple, and Red Alder are important tree species on this series. This soil has moderate equipment limitations for site preparation and timber harvest and moderate windthrow hazards because of its potential for wetness. It has rated as severe for plant competition against new seedlings. The Oridia soil has moderate to severe recreational and engineering limitations due to its flooding potential and high water table.

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