I can't see that the bridge closure should impact either of your activities. Iron Mountain Hot Springs is at a different Glenwood Springs exit. Yes, that exit will likely be busier. But I can't see it impacting things dramatically. On rafting, it depends on the raft company. The company we usually use (Rock Garden) is located at exit 119 (No Name) east of Glenwood Springs.
You shouldn't face much more than normal traffic. You might have a slowdown just coming into town, but with a little patience, it will be tolerable.
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