Pouring steps down to the creek/swimming hole...nope, never done it before!

[2manyrocks]

Looks like the OP would either need a crane or would have to set some temporary beam with a hoist to use a tremie?

If he isn't going to place wet concrete at the base, I suspect he'd still need something similar to set a similar sized huge rock.

Or maybe it won't rain during the month of August and the water levels will drop.

 

[MotorSeven]

I think a Tremie is out. I deleted the pad in the creek for the one by the swimming hole dam....it just stuck out too far in the current. The last tread is sitting on the end of the rip rap, so I think I can dig a pretty good hole there to fill with crete.

Here it is with the blow out forms all done, and all that is left is the rebar:

As for the blow out prevention, I bucket-ed up sand/rocks from the creek to fill in any gaps below the OSB.

 

[ultrarunner]

Any idea how many yds of concrete required?

I need to do similar on a downslope but no water or creek issues.

 

[2manyrocks]

Concrete calculator for stairs is at the bottom of the page. Concrete Calculator

But the OP's stairs look really, really, deep to fill with concrete.

 

[ultrarunner]

Concrete calculator for stairs is at the bottom of the page. Concrete Calculator

But the OP's stairs look really, really, deep to fill with concrete.

Im thinking the finished weight will be considerable...

 

[Streetcar]

I would add more support of Osb . There will be a lot of pressure from concrete on forms.
on side note bottom of riser is typically cut at 45 degree angle to aid finishing tread

 

[Streetcar]

Im thinking the finished weight will be considerable...

guessing finished weight will be between 4to5 tons

 

[MotorSeven]

I calculated between 4-5 yards, so 7,000 +- Lbs each. As far as blow out protection, all I did is to stake it where possible due to hitting rock everywhere else. If you think it will help, I can add 2x6" vertically screwed to the sides of the stair tread down to the ground/rock every few feet. We will set large rocks against it when I have some help right before the pour. Maybe I can cross brace things horizontally from other rocks several feet away in some places.

I have asked for a wet mix when filling basement block, so I assume I can get a dry mix? A thicker pour would help contain it, but shorten working time, so we will have to hustle. What I want to try, is to pour only half way up, then move the truck to the other staircase and repeat. This will give it time to set up a little before filling to tread height.

I did not do a chamfering edge in the form, so will just hit it with the edging trowel instead.

Yes, the one next to the pigs is the taller one by a good margin & is worrsome. The rip rap under it is huge there, with lot's of voids going down 2-3'. Bucketing gravel in those voids is slow work, but it does fill them up. Working on it Sunday, as it's pontoon time on the lake today and tomorrow.

 

[2manyrocks]

What is the temp and humidity you're working in? The heat index in Middle TN is supposed to be 105-106 today.

 

[ultrarunner]

I added a couple of lengths of threaded rod to keep my stringers firmly in place…