On August 11, 2011, the Census Bureau released the Iowa SF1 (summary File 1) data to the public. Being the obnoxious data hound that I am, I can't resist playing around with this information to see what jumps out... In this first installment, I'm going to take a look at the statewide data aggregated to the Street Crowd (historic): This image is in the public domain, via Wikimedia CommonsStreet Crowd (historic): This image is in the public domain, via Wikimedia Commons"place" level - identified towns and cities. Rural residents who don't live in an incorporated town or city are not included in these numbers.

You can check out Des Moines' stats below the break.

Iowa's total population is 3,046,055 people

Of that, 2,421,895 (79.5%) have chosen to live in an incorporated town or city. There are 1,009 incorporated towns and cities identified by the Census bureau for reporting purposes. However, 140 of those towns have fewer than 100 residents.

The average population of an incorporated city in Iowa is 2,400 residents. The top quintile (highest 20% by population) averages 10,334 residents. By a factor of 1.6, more people choose to live in Des Moines than the next most populated city, Cedar Rapids.

The Top 10 Iowa Cities by total population are:

    City Population
    Des Moines 203433
    Cedar Rapids 126326
    Davenport 99685
    Sioux City 82684
    Waterloo 68406
    Iowa City 67862
    Council Bluffs 62230
    Ames 58965
    Dubuque 57637
    West Des Moines 56609

Despite having the fastest growing suburbs in the state, only one of the Des Moines area suburbs makes the top 10 in total population. In fact, only one of the top 10 most populated cities in Iowa is a suburb.

Continue reading...

The Color Of

14 Aug 2011

Via the fabulous "the color of" website, here is the color of Des Moines:

The Color of Des MoinesThe Color of Des Moines

Continue reading...

Data hounds have been salivating for months over the timed release of the Census 2010 data files. Yesterday, the Census Bureau released the 2010 redistricting data for Iowa!

The redistricting data includes basic population and housing information - the full data sets of all long-form data, much of it down to the block unit level, will not be released for some time.

Look for some interesting maps and analysis from DMPerspective in the coming weeks as I crunch through the data!

Continue reading...

A couple weeks ago, I was a guest on Michael Libbie's show "Insight on Business". I had a great time talking with Michael about preservation for almost an hour. One of the questions he sprung on me was a comparison between the troubled West Glen development in West Des Moines and the redevelopment of the Historic East Village neighborhood adjacent to downtown. That question sparked an idea for this blog post: a comparison of the physical characteristics between an established urban neighborhood and a new "urban" development.

Then it got really cold and snowed, so the concept morphed from a physical comparison to a conceptual comparison based on the two neighborhoods' web presence. No way I'm driving out there to take photos in this weather. Instead, I embarked on a journey through the interwebz in order to do research from the comfort of my own couch. [Note: I did actually end up getting photos yesterday because I happend to find myself near both Historic East Village and West Glen anyways.]

Continue reading...

Urban Elements

02 Aug 2010

[Note: I'm reposting this blog originally written in 2008 because it's one of my favorites and because it is particularly relevant in relation to the recent bike lane and commuting blog posts]

Several factors go in to determining how "urban" a neighborhood is: compactness, connectedness, population diversity, diversity of use, and relationship between the private and public space.

The following graph plots these characteristics for a variety of different neighborhoods. The more area enclosed by the graph, the more "urban" a neighborhood is. Continue below the graph for some examples of how it relates to actual Des Moines neighborhoods.

Urban Elements GraphUrban Elements Graph

Continue reading...

What's the Rush?

16 Jul 2010

Lego Rush HourLego Rush HourOne of the responsibilities of the Des Moines Area Metropolitan Planning Organization is to monitor and report on interstate highway traffic patterns. This data is used to build a long-range transportation plan based on traffic and trip projections.

The Business Record recently published an article analyzing 2009 MPO data (PDF report) that contained a table with morning and evening commute data between downtown and the western junction of I-235 and I-35.

Stick with me through this analysis - am I reading this data right?

The distance from Downtown to the the I-35 junction is 8.3 miles. Of that segment, approximately 5.5 miles is posted at 60 MPH and 2.8 is posted at 55 MPH. Therefore, the legal minimum amount of time it takes to drive from downtown to the western junction is (5.5/60)+(2.8/55)=.143 hours or 8.55 minutes.

Because 8.55 minutes is the fastest one can legally drive the segment of I-235 between downtown and the western junction, I'm going to refer to this as the "legal posted minimum" travel time.

Rush Hour?

According to the MPO data as presented by the Business Record, Des Moines doesn't really have a rush hour.

Actual measured average travel time over this segment only exceeds the legal posted minimum travel time between 7:45 and 8:15 am in the eastbound lanes and between 5:00 and 5:45 pm in the westbound lanes.

It gets even better!

According to the Business Record analysis, the average difference in commute time between the actual measured and the legal posted minimum is a minuscule 15 seconds! In other words, if you drive legally and safely even when you can speed, your commute between the western suburbs and Downtown Des Moines will average only 15 seconds longer during "rush hour".

Of course the speed data also includes those people that put the pedal to the metal once they have an opening in traffic. And, during non-rush hour times, the average speed across the entire segment is above the posted limit. In some areas, significantly above.

Breakin' the Law!

Discussing the data, the Business Record said:

Your absolute best option - if your bosses will allow it - is to get on I-235 at about 7 a.m. and go home at about 4 p.m. Over the course of time, you could save three minutes per day on average. That might not sound like much, but translate that over the course of 10 years, and you can save upwards of five days of your life.

Actually, this is only true if you break the law.

Continue reading...

The Census Bureau releases annual population estimates by City. The most recent (2009) estimates were released last week.

I pulled statistics for the Des Moines metro area and created a couple graphs to show trends over time. Here are the top five things I noticed in these graphs:

1 - The City of Des Moines has clearly turned a corner

Like many central cities that have experienced declines in population, the City of Des Moines is is now gaining population in absolute numbers. This is good for the City and good for the region.

Des Moines MSA Population Trend by CityDes Moines MSA Population Trend by City

Continue reading...

In an article published on July 10, 2008, the Des Moines Register claims that "More Iowans like suburban life". The article is based on updated Census estimates for 2007. In fact, an examination of the underlying data leads me to the opposite conclusion: More Iowans actually prefer living in central cities and towns.

Here are some reasons why.

Continue reading...