I've never been to the hot springs, but FWIW I was paddling on Pitt Lake about 10 days ago and the water was very high. Seems likely to me that the river would be quite high right now too.
I second this comment. Went paddling across to the Widgeon campsite on Saturday and have never seen the water so high. Not sure on the whole tide thing there but we spent 6 hours and the "low" tide water level was still extremely high - so I am sure Pitt River will be higher than usual too.