ECR is not something the US immigration is concerned with. It is only a formality for India; and it only applies if you are traveling for work and even then, to a limited set of countries which does not include the US.
Here is the official reference, from the Ministry of Overseas Indian Affairs (I have highlighted the relevant parts):
Emigration Act, 1983 provides that no citizen of India shall migrate
unless he obtains emigration clearance from Protector of Emigrants.
Similarly, it has been recognized that certain countries (currently
17) do not have strict laws regulating the entry and employment of
foreign nationals. They also do not provide avenues for grievance
redressal. Thus they have been categorized as Emigration Check
Required (ECR) countries. Hence, all persons, having ECR endorsed
passports and going to any of the 17 ECR countries for taking up
employment require emigration clearance. However, ECR passport holders
going to any ECR country for purposes other than employment do not
require emigration clearance. No specific mention of ECNR is made on
the passports and the ones not endorsed as ECR, automatically belong
to ECNR category.
If you were to a take any GCC airline, you would be a transit passenger and ECR will not apply.
To put it bluntly; if you are able to exit the country, and you have a valid visa for the US - you should have no issues during your travel and on entry that have to do with your ECR.