Thanks, I see them now.
Is this common practice for that type of construction in CA?
I really don’t know if this is common in CA. I went to
Google street view and found both concrete and steel bridges on I-15 in that area - but always pre-cast concrete.
Building forms like that is usually associated with construction where long term traffic disruption is not a problem. And this bridge was a brand new connection across I-15, so quick timing wasn’t really an issue. Now there is the small matter of having to protect the motorists below from falling debris for months and months.
I have a suspicion - for ARRA projects (Stimulus), there is a ‘buy American’ provision. Its possible that in California, so much of the steel comes from China, that concrete has become the preferred material for Stimulus projects. However, I really don’t know why they wouldn’t pre-cast on what looks like a very normal bridge.