Soil strength is an important parameter for planning of forest roads and harvesting operations. Locating roads to areas with high soil strength reduce both build and maintenance costs for forest roads. Locating logging trails to areas with high strength can minimise soil disturbances, e.g., rutting and compaction, of forest soils. GIS-based maps of soil type and soil moisture can be valuable tools to estimate soil strength. Our aim was to evaluate the use of soil moisture, i.e. depth-to-water (DTW), maps and soil type maps, to estimate soil strength expressed as California bearing ratio (CBR). CBR, volumetric water content, and ground penetration were measured in 120 sample points, separated on three soil classes (clay-silt, sand, till) and two soil moisture classes (wet, dry). In each point, soil samples were collected for validation of the soil type maps. There was a high conformance between soil moisture predicted by DTW maps and the field measurements, but conformance of the soil type between maps and field estimates varied between soil types. For sediment soils the difference in soil strength between dry and wet condition was consequent. The soil strength of till soils was more complicated with a binary CBR distribution depending on soil stoniness. Till soils possible to penetrate to 20 cm depth with the dynamic cone penetrometer got CBR values close to those for the sand sediments, otherwise CBR is assumed to be high. The studied DTW and soil type maps had potential for estimating soil strength, measured as CBR.