Yeah after 10+ years in the excavation business I can tell you that hydraulics and diesel will never compare to the force of moving water.
At some point you got to figure the true cost over time of how many times you will have to fix crossings like that and start looking at if its feasible to put in a steel bridge over the draw vs. your typical culvert & rock crossing.
You can buy used drill stem cheap these days and even if you had to put piers in the creek bed if they get washed out you could have a welder cut them off with a torch and re-weld new ones cheaper than the cost of getting dozer/excavator and concrete out there..... assuming you don't have your own equipment on site.
thanks for sharing your experience
I've thought about using big rocks / boulders, like they used for bridge pilings.... have you done anything like that inland and your thoughts ?
I fixed a creek crossing using 4 oil field grates (6x15; 1000 lbs )
it worked by slowing down current , trapped debris and build up over time
I had 1-2' of build up
running water cuts so my design was to prevent that cutting and it worked for that creek
but that's a lot more money than a 53' belly dump of boulders