How is a Soil Survey Done

Soil Scientists study soil and landscape relationships, predict patterns and make accurate soil maps. Map making requires field verification samples and then some laboratory analysis. During a soil survey, the soil scientist team walks over the landscape, uses a hand auger to dig 3” diameter holes so that they can examine cross sections of soil profiles. They determine the texture, color, structure and reaction of the soil and the relationship and thickness of the different soil layers. Also recorded is the depth of the root zones, number and amount of organic materials and the acidity or alkalinity of the soil.

Once field maps and the corresponding interpretations are completed the data is transferred to a digital geographic information system and published on an interactive CD ROM or Web Soil Survey.

The Spokane County Soil Survey team always tries to respect the property owners in the areas where they are sampling. They park on roads, traverse fields on foot and fill in their sampling holes. Gates are left as they are found and the scientists try hard not to leave any trace of their visit. The team is always willing to work with landowner and operators about any concerns that they might have. Their trucks carry very apparent signs saying “Soil Survey Team”.

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