Compaction quality of base and subbase layers has a major effect on the overall performance of pavement structures. Therefore, it is important to insure that base and subbase layers are compacted properly during construction by using non-destructive testing methods. Nuclear density gauge is one of the most commonly used methods to measure density (stiffness) of compacted base and subbase layers. However, using a nuclear based equipment requires addition training, safety and environmental considerations, which results in additional operating and maintenance costs. Light Weight Deflectometer (LWD) has been used by contractors and agencies, as an alternative tool, for on-site assessment of compaction quality of base and subbase layers during construction. LWD is a portable equipment, easy to operate, and practical to use for evaluating the stiffness as well as the dynamic California Bearing Ratio (CBR) of compacted granular materials.The aim of this study is to investigate the feasibility of using LWD to assess compaction quality of base and subbase layers during construction. This paper compares measurements taken by a nuclear density gauge and a ZFG 3.0 LWD for base layers during construction of pavement projects in Saskatchewan, Canada. Surface deflection and CBR results obtained from LWD testing will be compared to nuclear density gauge results as well as laboratory CBR results.