This document summarizes a study on effectively grounding microstrip lines. The study measured the via hole inductance of microstrip lines on a GaAs substrate using a vector network analyzer. A test structure with a single via hole was fabricated to approximate a 50 ohm microstrip line. Via hole inductance measurements were taken from 1-5 GHz and the mean inductance was calculated to be 43.29 pH. The preliminary investigation provides useful information for designing microwave integrated circuits using microstrip lines with effective grounding.