Interesting. I tried to look online for the data but am having trouble, do you have a link? I did find the following newsok article:
http://newsok.com/five-bodies-of-wat...rticle/3254446
The article says that the stream is regulated and that helps with storm runoff issues, and that as you said a landowner group is helping enact pollution reducing management practices in the basin. I'm trying to find more info though. Some questions one might ask:
1.) How is the dam regulated? At what flow is the spillway/release designed for? An extreme event may cause runoff to reach the creek where people swim (although I hope folks would have enough sense not to swim just after a major flood event, for both drowning and contamination risks) - extreme flow can bring a high bacterial loading, even from "natural" sources. I'm not sure on the basin size, so maybe this isn't even an issue - just a question I have at this time not knowing much about that particular tributary.
2.) When and where was the sampling done? One issue that comes to mind is bacterial pollution from swimmers themselves. When I went to the creek it was very crowded and there were many small children there. I'm not sure how often the swimming hole is occupied, I was taken there by someone else just once, so I could be mistaken (heck, we might not even be talking about the same stream here, just assuming we are). But anyhow, if this is true, was the sampling done downstream from the watering hole or downstream from known pasture areas, during the summer months? Just something to consider.
3.) Similar to question 1 above, was the sampling done during both high and low flow conditions? Bacterial contamination, as is loading from many constituents, can vary greatly with streamflow (and I'm also assuming that the clean status also has to do with bacterial concentrations from the samples). Again though one assumes that most swimming is done at low flow and so low flow sampling should be pretty representative.
Regardless, its good to hear that in general there is a low probably of bacterial contamination under the sampling conditions in which ODEQ made their assessment. Still not convinced at this time that it is the "cleanest stream in the US" - but again, that's a very hard goal to achieve. As someone who deals with these issues regularly, I'm looking for that water quality data and trying to answer some of the questions above. Anyhow, sounds like if you're going to pick a stream to swim in, according to ODEQ, Spring Creek is probably a good bet compared to other streams. There is always a risk though...
If you can find an online link to the sampling report, could you post a link, that would be really cool. Unfortunately my search on the ODEQ website for this particular site is not resulting in much luck (and Spring Creek is the name of several unrelated bodies of water too which makes things confusing). I realize that this is sort of off topic, so feel free to send me a PM too.
But to tie this back to the original topic - I still stand behind this - there is always a risk of bacterial illness from contact with natural waters even if the sampling data, taken under certain conditions where certain assumptions are made, reveals otherwise. The level of risk is always the question. But no surprises about the sickened athletes, and no blame for the source until more questions are answered (and even if the questions are answered, there may not be much we can do about it...)
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