Take any of the three routes off I-70 between Golden and Glenwood Springs, and you’ll have a line in the door at the taproom. No color-coded place was spared from the craft beer revolution in Colorado. In fact, it was the attack that came their way.

However, there is one slight drawback when drinking beer a mile or two up in the hills, one that most Americans on ‘road’ trips won’t consider. A Rockies sunset is as probable as the Rockies pouring beer; probability theories aside, the thin air has other effects. Foam that does not settle. Empty beer bottles and cans.Flattened beers before they reach the glass. It is indeed a problem, and Colorado bar owners have been pondering how to solve it for decades.

The Altitude Problem Nobody Warns You About

Beer is carbonated under pressure, and pressure behaves differently as elevation climbs. At sea level, a standard draft setup pours clean without much fuss. Get up to 7,000 or 8,000 feet, where a lot of Colorado’s best small breweries and taprooms sit, and that same setup can turn into a foamy mess, even at some of the best beer bars, where properly balanced pours are part of the experience.

This isn’t a new issue. Bars in Leadville and Breckenridge have dealt with it for generations. What’s changed is the sheer number of places pouring craft beer now, which means a lot more equipment that needs to be calibrated correctly for the thin air it’s operating in.

What Actually Happens Inside the Tap Line

A draft system is more complicated than most drinkers realize. Beer travels from the keg through a regulator, a glycol chiller, beverage tubing, and finally a faucet, and every one of those parts has to be tuned to the specific pressure conditions of that location. Get one setting wrong at altitude, and you’ll taste it in the glass. That’s the difference between a bar that just has good beer on tap and one that actually pours it well.

Foam, Flat Beer, and the Science of Pressure

Foaming happens when dissolved CO2 comes out of solution too fast, usually because the system pressure doesn’t match what the beer and the elevation require. Flat beer is often the opposite problem: not enough pressure holding carbonation in the liquid on its way to the tap. Even a crisp, easy-drinking release such as the Pour Man’s Release

 Wild, uneven pours can also come down to line length or temperature swings in the chiller. None of this is visible to a customer sitting at the bar. You just know the pint in front of you looks or tastes off. A shame, honestly, for a brewery that put real work into the recipe.

Why Small Bars Struggle More Than Chains

Larger restaurant groups often have maintenance contracts and staff trained specifically on draft equipment. A lot of Colorado’s best road food stops are one-owner operations, running a kitchen and a bar with a skeleton crew. Getting the pressure and temperature dialed in for their specific elevation isn’t always the priority when you’re also flipping burgers and running the register.

In Colorado, bar owners dealing with foam and flat pours sometimes call in outside help. Companies like Denver Beverage, which specialize in beer dispensing equipment, can troubleshoot altitude-related pressure problems as part of routine service calls. It’s a quiet piece of infrastructure most diners never think about, right up until the beer arrives perfectly.

What This Means for Road Trippers Chasing the Perfect Pour

If you’re currently planning a Colorado food and beer crawl, then elevation should be taken into consideration, similar to hours for restaurants. 

In a place like 9,000 feet in the heart of Durango, there is no job as hard, technically speaking, in the middle of a ski town as creating a brewery; good ones have simply done the work. That’s one of the reasons that some small mountain taprooms go to great lengths. Their creation of the pour has shifted attitude, from a side dish to an art form.

How to Choose a Bar That Takes Its Draft System Seriously

If a head is not tight and clean, and collapses in less than a couple of seconds, it is not what you need. Inquire with the bartender about the frequency of the lines being cleaned. If you’re proud of your set-up, you will most likely have an answer and even a good, enthusiastic one. It is normal to have a small amount of foam. Beer that doesn’t flow often means that there is a leak upstream, and that’s at least beer filled with a bucket. Beer that doesn’t flow is usually a result of something upstream that needs brushing, just as it can with high-altitude cocktails, where conditions can also affect how drinks are prepared and served.