1517 132ND ST SE 2024-12-09 - Laserfiche WebLink

Map Unit Description: McKenna gravelly silt loam,0 to 8 percent slopes---Snohomish County Area,Washington Snohomish County Area, Washington 32—McKenna gravelly silt loam, 0 to 8 percent slopes Map Unit Setting National map unit symbol: 2hyp Elevation: 50 to 500 feet Mean annual precipitation: 30 to 60 inches Mean annual air temperature: 48 to 52 degrees F Frost-free period: 150 to 180 days Farmland classification: Prime farmland if drained Map Unit Composition Mckenna and similar soils: 85 percent Minor components: 15 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Mckenna Setting Landform: Drainageways, depressions Parent material: Basal till Typical profile H1 - 0 to 8 inches: gravelly silt loam H2- 8 to 33 inches: gravelly silt loam H3-33 to 60 inches: very gravelly sandy loam Properties and qualities Slope: 0 to 8 percent Depth to restrictive feature: 20 to 40 inches to densic material Natural drainage class: Poorly drained Capacity of the most limiting layer to transmit water(Ksat): Very low to moderately high (0.00 to 0.20 in/hr) Depth to water table: About 0 to 6 inches Frequency of flooding: None Frequency of ponding: Frequent Available water storage in profile: Low(about 4.9 inches) Interpretive groups Land capability classification (irrigated): None specified Land capability classification (nonirrigated): 6w Hydrologic Soil Group: D Forage suitability group: Wet Soils (G002XN102WA) Hydric soil rating: Yes Minor Components Norma, undrained Percent of map unit: 5 percent Landform: Depressions Hydric soil rating: Yes usDA Natural Resources Web Soil Survey 1/29/2019 Conservation Service National Cooperative Soil Survey Page 1 of 2