A couple of nice little bottles - off old bridges has turned up my best dig site by far! I'm thinking the bottles you have here are probably 20s-40s, maybe even stretched to 1950.
I didn't do a very deep dive, but the South River Bottling Co. was in business at least through the 30s and 40s. Given that this is an embossed soda (as opposed to an ACL) I'd be more inclined to assume it's closer to the 30s than the 50s. The other bottle looks very similar to some embossed wine bottles I find at a dump I can confidently date to the late 40s through early 60s.