Attached are three free graphics showing IRC minimum access sizes.
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Thanks, Randy. Very nice of you and helpful.
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Very nice illustrations! I’ve seen crawlspace access topics with a lot of questions over the last few years. I’ll bet these will help a lot of people.
Very nice, Thank you sir
Thank you great Illustrations
These are great. Thank you!
So, curious what the smallest one you will enter is? Came across one today that was 11" tall x 21" wide. I could probably get in it, but pipes and all things considered, it would have been pretty useless.2 photos and a vid
Welcome to our forum, Peter!..Enjoy!..and participate. 
Think safety first!
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Even if you got in, where would you go? And how to get out? You made a good call and fortunately it was not to 911. 
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That’s the trick. Getting back out. I had one last week with the opening being just big enough, but with a tight window well getting back out would have been very difficult and hard on my back. So I passed and just reached in and took a lot of photos. And I get in most.
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Yep, get what you can get. Bert had a good idea; use the camera pole to get additional views. But I am afraid I won’t be able to control it and just bang my camera onto everything in the crawl.
*Looking at your photo, that is nothing more than a vent 
*
In my experience getting out of ones with the ridiculous area wells is easier than getting in. I’m not small by any means 6’4" - 215# but am pretty sure I’d slither right into the one pictured at the end.
Oregon is just loaded with crawl spaces and you’ll lose an agent in a heartbeat if you refuse one and they get someone else in there. If I ran the world it wouldn’t work that way but I don’t and it does.