{"thcode":3,"term":{"code":630,"name":"locks","parent":1174,"scope":"Stretches of water in canals, streams, or docks, enclosed by gates at each end, and used in raising and lowering boats as they pass from one water level to another. [Glossary of Geology, 4th ed.]"},"uf":[],"bt":[{"code":1174,"name":"transportation features","parent":643,"scope":null},{"code":643,"name":"manmade features","parent":1,"scope":null},{"code":1,"name":"Categories","parent":null,"scope":null}],"nt":[],"rt":[{"code":164,"name":"canals","parent":526,"scope":"Artificial waterways with no flow or a controlled flow used for navigation (canal), or for draining or irrigating land (ditch). [USGS Circ 1048]"}]}