Pasadena-based engineering, environmental and infrastructure services firm Tetra Tech Inc. has garnered a $33 million contract from the United States Army Corps of Engineers to design a new navigation lock on the Illinois River. The navigation lock is one of eight on the Illinois Waterway system connecting Lake Michigan with the Mississippi River on the west side of the state; most of the locks are on the Illinois River. These locks adjust water levels to minimize elevation changes for ships navigating the waterways. Read the full story by the Los Angeles Business Journal.