30. (1) This division shall not apply to dams, weirs or bridges erected in or over rivers, streams or creeks, nor to anything done bona fide in or for erecting such dams, weirs or bridges, nor to any obstruction caused by trees cut down or felled for the purpose of being used as bridges, unless the flow of water or the passing of rafts be impeded.
(2) Nothing in this division shall affect the rights of joint stock companies for driving timber.
(3) The work “timber” means saw logs, timber for building purposes and all other kinds of timber.