Ok so what is the secret door needing a keycard that is in one of the sewers by a bridge? The door resembles that of Valentine's quest on Eddie Winter's door but this is the only secret that I have found that I have still not revealed it's secret!

if its the one by lexington its for a rail road quest

No I finished all the quests and side quests of the whole game (I think), including finishing all four endings but have never used that door. Wondering what I may have missed. You go inside it and there is a room with locked door needing a keycard.

Oh there's a lamppost on some concrete above the tunnel.

If it is the one just north of Lexington, it is specific to the Railroad quest "Tradecraft" and I think only Deacon can access the terminal that opens the gate. Same as the Castle Armory door that only Ronnie Shaw can open during a quest.

Not sure about any other "sewer by bridge" pipe rooms.

oh and I think there are raiders near by.

you need to tell us the area

sewer by bridge with a lamp post well thats just a little vague.................

Sorry but this is not it. Thanks for the try though!

Ok I think there might be water sounds accompanying the water area.

no

like area of map, what locations is it near around, what direction from those marks, roughly how far too would be nice

eg " up north west side of map, slightly south of walden pond, maybe third the way from walden to arcjet"

I believe it is somewhere in the commonwealth.

seriously? dude the whole game is in the commonwealth

you have any idea how many bridges there are?

you need to tell us where on the map, just tell us the closest location mark it is by

Ok, I'm playing man! Thanks for being a good sport! Although, the location is real. In fact looking at the map it is the Public Works Maintenance area. Maybe I did already explore it but I may have been playing in my sleep when I did. I just don't ever remember doing it.

That might be the secret entrance to the Institute that you use to get in during the Minutemen ending.

Is there a small locked room to the left of the keypad that requires a terminal to open?

I'm pretty sure that's it as that place is called Public Works Maintenance.

Haha this thread made me laugh so hard, thank you for the fun.

Awesome and thanks for the post. I enjoy having fun on the forums and it's good to see there are still some of us left with a sense of humor.