The Maxwell Bridge curves while a straight bridge over the Napa River would be the shortest, simplest connection. I’d ask Caltrans, but since you earn a living doing this, why don’t you?

Well, aren’t you sassy. That’s great. I can appreciate sassy and classy but not — well, never mind that. Let’s keep it professional.

I’m not a Napa native and I have been here for a mere three years. So, when this question was submitted, I scratched my head trying to figure out which bridge this reader was talking about. The Maxwell Bridge — which, according to a 2007 Register article, won “Project of the Year” from the California Transportation Foundation — is the Imola Avenue bridge over the Napa River.

I do, however, remember from visits to Napa in 2000 the old Maxwell Bridge — green, metal, straight, and low to the waterline so it had to be opened to let maritime traffic through — though I didn’t know its name.

I thank you readers for submitting these questions. Because of you, I get to learn new things about this wonderful community that I live in that I probably would never have known about nor bothered to ask on my own because I’m too lazy/busy/unfocused (or all of the above?) to ask.

Back to the question. Marcus Wagner, Caltrans’ public information officer for Napa County, answered with one simple word: “leverage.” What did he mean? Leverage is defined as the mechanical advantage gained by the action of a lever. Also, thinking back on documentaries I viewed on either the Bay Bridge or the Golden Gate Bridge, I remember that they talked about bridges being curved so that they could sway naturally in the event of an earthquake. These curves are called fragility curves. According to information I found on the Mid-America Earthquake Center’s Web site, a fragility curve “represents the relationship between the intensity of a seismic event and the vulnerability of the structure.”

So the bridge curves in order that it may sway, as needed.

Here’s my question: How much shorter or simpler could the connection be without the curve? You can only go so fast on the bridge anyway — 35 mph, not 50 mph, like some drivers do — so whether it’s there or not wouldn’t be of much significance in getting you from Point A to Point B.

Better safe than sorry, I always say.

What is Glad You Asked?

Glad You Asked attempts to answer readers’ questions. Let me help you bridge the path between wonderment and knowledge. Send your questions to me at dmontanez@napanews.com or call 256-2224.