Hydraulic conductivity is the single most important hydraulic parameter for flow and transport-related phenomena in soil, but the results from different measuring methods vary under different field conditions. To evaluate the performance of four in situ saturated hydraulic conductivity (K_s) measuring methods, K_s measurements were made at four depths (15, 30, 60, and 90 cm) and five locations on a glacial-till soil of Nicollet (fine-loamy, mixed, mesic Aquic Hapludoll)-Clarion (fine-loamy, mixed, mesic Typic Hapludoll) association. The four in situ methods were: (i) Guelph permeameter, (ii) velocity permeameter, (iii) disk permeameter, and (iv) double-tube method. The K_s was also determined in the laboratory on undisturbed soil cores collected from all the five sites and four depths. The Guelph permeameter method gave the lowest K_s values, possibly because of small sample size, whereas the disk permeameter and double-tube methods gave maximum values for K_s with minimum variability, possibly because of large sample size. Maximum variability in K_s values for soil cores at shallow depths may have occurred because of the presence or absence of open-ended macropores. Estimates of K_s, however, are most comparable for the velocity permeameter and the laboratory method using a constant-head permeameter.