313A.3  Toll bridges constructed over boundary rivers.
  The department is hereby authorized to establish and construct toll bridges upon any public highway, together with approaches thereto, wherever it is considered necessary or advantageous and practical for crossing any navigable river between this state and an adjoining state. The necessity or advantage and practicality of any toll bridge shall be determined by the department. To obtain information for the consideration of the department upon the construction of any toll bridge or any other matter pertaining thereto, any officer or employee of the state, upon the request of the department, shall make reasonable examination, investigation, survey, or reconnaissance to determine material facts pertaining thereto and shall report such findings to the department. The cost thereof shall be borne by the department or office conducting it from funds provided for its functions.
[C71, 73, 75, 77, 79, 81, §313A.3]