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Sanitary Manhole

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Field Dog
Posts: 1090
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Topic starter

Can anyone identify this type of sanitary manhole?

Posted : January 28, 2023 3:14 pm
Posts: 63
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a Junction Box type structure that is probably bolted with no access. most likely put in as a field change during construction that didn't fit the topography as originally surveyed. Pain in the a77 for the next persons

Posted : January 29, 2023 7:00 am
Field Dog
Posts: 1090
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Topic starter


It makes sense about it being a junction box, but why do you say it's probably bolted with no access? It looks like the inner part is removable for normal inspection of the structure, while the outer part is removable to get easy access to the periphery of the structure. If I were locating this sanitary manhole, I would call it an SMH, but if I was doing a specific purpose survey, I might go a little deeper and maybe call it an SMHJB. Any thoughts?

Posted : January 29, 2023 7:24 am

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Brad Ott
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Posted : January 29, 2023 7:58 am
R.J. Schneider
Posts: 2802
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Sanitary MH. Looks heavy. Had a topo once where two of these larger MHs were set in the flowline of the bar ditch. Didn't see the first one due to it being underwater on the first pass.

When I did finally uncover it there was the "Danger 250 Lbs." label on the lid. It was bolted.

I might watch too many sci-fi/horror movies but, I got to wondering why you had to bolt a 250 Lb. MH lid.

Posted : January 29, 2023 12:39 pm
Norman Oklahoma
Posts: 6863
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I can't stress enough that a manhole lid is not a manhole. There might be anything under that lid. Open it and look. 

Posted : January 29, 2023 12:48 pm
Jaccen, Jim in AZ, SReeserinPA and 7 people reacted

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CV Nevada
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Posted : January 29, 2023 2:16 pm
Sergeant Schultz
Posts: 900
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I like to stop at the treatment plant & peek at the as-built plans, if available.

Posted : January 29, 2023 2:25 pm
Brad Ott reacted
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Popped the lid on one to do an invert and it turned out to be a storm drain being fed by a spring or something. Shined a flashlight down in the pool and sitting in there was 12” trout looking quite content just hanging out. 

Posted : January 29, 2023 7:54 pm

Carlson BRx7 GNSS Receiver

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I found this on Friday last... decorative and thinner lid in an artsy fartsy topiary fountain area....


I wasn't about to plunge the rod into the abyss because it is also adjacent to the dog relief area...

taped a few lath end to end and slowly inserted into the darkness till refusal.

damned if it didn't read at 5.00 at the water mark on the sticks.


theory is it's the pump vault of the fountain and it was a horrible idea for me to imagine it recycling the filthy water while kids are frolicking in the majestic demonstration of hydraulic art just 25 feet away...


Posted : January 29, 2023 11:14 pm
Brad Ott reacted
Jim Frame
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Posted by: @jitterboogie

it was a horrible idea for me to imagine it recycling the filthy water while kids are frolicking in the majestic demonstration of hydraulic art just 25 feet away...

My town had a kids' fountain like that for years in the central park, until the county Environmental Health people ordered it shut off due to bacteria levels.  It's been closed now for at least a decade as the city searches for funding to install a new water treatment system that will enable the fountain to be reactivated safely.

Posted : January 30, 2023 8:32 am
Posts: 1753
Mapper of Things Member

Looks like a storm drain manhole that they threw a sanitary lid on because that's what was convenient.  Is there an inlet on the other side of the sidewalk right there?

Posted : January 30, 2023 12:29 pm
Brad Ott reacted

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Gordon Svedberg
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@williwaw That must be the  Jean Valjean of fish you saw. : )    I have seen storm drain grates with an image of a trout on the frame.

As for the MH, is it relatively close to the SS treatment plant?

Posted : January 31, 2023 7:48 am
Posts: 3253
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@gordon-svedberg When you're expecting a brown trout floater and the eyes bulge a bit to see a fat healthy rainbow. Nobody believed me until I showed them and then they still didn't believe it. 

Posted : January 31, 2023 8:50 am
Posts: 32
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@rj-schneider so it doesn't turn into a 250 pound cannon pancake if the gases in the pipes below should ignite and explode

Posted : February 1, 2023 2:28 am

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