Per here

https://www.catchments.ie/data/#/waterbody/IE_SH_23B040150?_k=0ngsvv

This is the sampling location for the big river but it is only sampled on an annual basis. The only automatic samplers in the area are at the waste treatment plant (sample incoming, sample outgoing). 

Based on this, I don't think the man_made=monitoring_station tag is suitable for this location so I'm going to close this one as I don't believe there is any other tag (that I could find on taginfo and the wiki) that would apply here 