Operational information means basic information about navigational objects, their operating times and contacts. Operational information represents RIS information items according to Section 4 of Decree No. 356/2009 Coll. on information recorded in River Information Services. The input format is governed by the XML standard for facility files and is defined according to the current version of the Encoding Guide for Inland ENCs. Data sets on the EuRIS API also contain international data from partner states that apply selected types of services according to Directive 2005/44/EC of the European Parliament and of the Council on harmonised river information services (RIS) on inland waterways in the Community. To filter the data of a specific object, it is necessary to enter its so-called ISRS code in the EuRIS API. The current list of ISRS codes for the Czech Republic is given in the so-called RIS Index on the EuRIS portal page after checking the filters "Country: Czech Republic" and "Function: Lock, Lift Bridge". The link to the RIS Index list is: https://www.eurisportal.eu/waterway/risindex