Preliminary 1999 Iowa Bypass Study

1 Snyder & Associates, Inc. — Iowa DOT — Bloomfield City Council — Sept. 29, 1999 Preliminary

Preliminary1999 Iowa Bypass Study

Prepared by Snyder & Associates, Inc.

for the

Iowa Dept. of Transportationand presented to the

Bloomfield City Council & CommunityWednesday, September 29, 1999


Why Iowa Builds Bypasses

• Part of the Commercial Industrial Network (CIN) investment strategy. – Improve flow of commerce: longer trips, improve

travel time.

– Make travel more convenient, safe & efficient: limited access highways, no slow down in small towns, eliminate competition with local traffic/pedestrians.

– Better connect Iowa with regional, national & international markets.

– Concentrate a major portion of annual construction budget on CIN.


Interstate & CIN:Arterials of the State

• 64% of rural highway traffic is on the Interstates & CIN system.

• 82% of rural semi-truck traffic is on Interstates or CIN (20% uses CIN).

• 80%+ of Iowans live within 10 miles of the Interstate or CIN.

• Interstate & the CIN account for only 32% of the total rural highway miles.


Iowa’s Existing & ProgrammedNon-Interstate Bypasses

Map shows Interstate System & Commercial Industrial Network

Winterset

Perry

Ogden

Prairie City

Pella

Iowa Falls

IndependenceCascade

Maquoketa

Eldridge

Waverly

Denver

Bloomfield

I-80

I-80

I-35

I-35

I-29

Existing Non-Interstate Bypasses (75) Programmed Bypasses (33)

Community Included in this Study


12 Study Communities

Bypass Community Pop. Bypass Route Year Bypass Opened

• Denver 1600 US Hwy 63 1994

• Eldridge 3638 US Hwy 61 1983

• Independence 5972 US Hwy 20 1983

• Maquoketa 6130 US Hwy 61 1998

• Ogden 1909 US Hwy 30 1968

• Pella 9270 IA Hwy 163 1994

• Perry 7244 IA Hwy 141 1977

• Prairie City 1366 IA Hwy 163 1997

• Waverly 8539 US Hwy 218 1997

• Winterset 4196 US Hwy 169 1977

• Cascade 1812 US 151 Future

• Iowa Falls 5435 US Hwy 20 Future

Reference

• Bloomfield 2580 US Hwy 63 Future


Study Scope

• Summarize other research.• Collect & analyze basic socio-economic data for

12 communities.• Make site visits and interview local leaders,

officials, and business people.• Write up individual case study findings for each

community.• Summarize findings of new research.


What we looked at:

• Retail Sales Analysis• Regular City Valuation• Changes in Traffic Patterns & Volumes• Population• Misc. Factors

– Regional Population & Distance from Metro.

– Local Major Employers - what types


What we didn’t do:

• Develop predictive models of bypass impacts.• Conduct travel time/destination surveys.• Conduct statistical analysis to separate bypass

impacts from other local impacts (i.e. job loss/gain, nearby attractions, regional/national economic conditions, etc.)


Previous Case Study Research

• Impacts of Highway Bypasses on Kansas Towns, 1996.

• The Economic Impacts of Highway Bypasses on [Wisconsin] Communities, 1998.

• Economic Impacts of [Texas] Highway Bypasses, 1992.

• The Economic Impact of Rural Highway Bypasses: Iowa and Minnesota Case Studies, 1992.

• A Literature Review of Urban Bypass Studies, Iowa DOT, 1992.


Conclusions of Previous Research

• Long term, no significant negative impact; some benefit from encouraging location of basic industries (results in spin off $ in other sectors).

• Short term, only negative impacts in some travel related/dependant businesses.

• Towns over 2,000 pop. and county seat most likely to see community-wide benefit.

• Commercial property values on “old route” do not decrease.

• In larger, established towns, traffic on the “old route” is close to pre-bypass volumes.

• Percentage of “impulse” or drive-by customers is declining - not as big as in 1970s.

• More impact than Bypass:– Economy/recessions

– Fuel efficient cars

– Changing travel habits/ commuting

– 4-lane highways

– Urbanization of the Midwest


Conclusions of Previous Research

• Merchants thought bypass improved “quality of life” & shopping environment.

• Safety, noise, etc. improved in downtown and residentail areas after the bypass.

• Merchants observed traffic reductions but reported little (or no) loss of business activity.

• Growth tends to spread along “connector” roads to bypass interchanges.

• Distance of the downtown from the bypass has no long term impact.

• Travel related businesses that close after bypass are usually replaced.

• Communities realized that a highway improvement and bypass will require preparation & planning.


Changes in Population

• Studied population changes of 127 Iowa communities.

• Divided communities into communities with a bypass, communities on the CIN, and county seat communities.

• Study shows no indication of bypass causing a decrease in population or overall economic activity.

• Towns on the CIN experiencing growth since the 1950s with and without a bypass.

• Other factors, such as access to markets (via highway, rail, air, or water), have more impact on population than presence of a bypass alone.


Historical Retail Sales for Study Communities: 1971-97

• Indexed per capita retail sales for the town against the state (i.e. ISU Extension’s “Pull Factor”).

• The Study towns follow typical pattern, gradual decline through 1970-80s, followed by stabilization from ~1987.

• A Control group of Non-CIN/Non-Bypass towns* more “remote” in 1970s but suffered more drastic decline overall. Same as CIN/Bypass towns by late 1990s. This highlights change in travel and purchasing patterns.

• Many forces at work, bypass is small part. Urbanization, Ag economy, changing travel patterns bigger factors.

* Centerville, Grundy Center, Oelwein, Shenandoah, Vinton, Washington, West Liberty.


FY71-97 Retail Sales Index1960-70s Bypass Communities

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

Ogden Perry Winterset Study Avg Control Avg Bloomfield

Indicates year bypass opened


FY71-97 Retail Sales Index1980s Bypass Communities

0.6

0.8

1.0

1.2

1.4

1.6

1.8

Eldridge Independence Study Avg Control Avg Bloomfield



FY71-97 Retail Sales Index1990s Bypass Communities

0.6

0.8

1.0

1.2

1.4

1.6

1.8

Denver Maquoketa Pella Prairie City Waverly Study Avg Control Avg Bloomfield



Changes in Downtown “Old Route” Traffic Volumes

Before AfterSample communities under

2,000 population, limited CBD

• Denver 7,800 2,760 - 65%• Prairie City 6,000 2,609 - 57%

Sample communities over

5,000 population, CBD, destination

• Pella 11,100 11,400 + 3%• Waverly 9,700 10,100 + 4%


What do the traffic changes mean?

• Removes trucks, improves safety, reduces noise.• In small communities, most highway traffic is

“through trips.”• In larger communities traffic in the downtown

CBD may even increase after the bypass.– Established destination: shopping, county seat, jobs,

service business, tourism, etc.

– Local traffic starts to use “Main St.” again relieving surrounding residential arterials. Improves safety in surrounding neighborhood.


Change in Regular City Valuation

• Wide variation in growth rate among bypass communities, but average growth rate is same as the state average for all cities.

• In general, cities nearer metropolitan/micropolitan areas had higher growth rate. (i.e. Denver, Eldridge, Independence)

• Some link to opening of bypass or 4-lane highway (i.e. Prairie City)


Indexed Change in Regular City Valuation

0.90

1.00

1.10

1.20

1.30

1.40

1.50

1.60

1.70

1.80

fy89 fy90 fy91 fy92 fy93 fy94 fy95 fy96 fy97 fy98

1990s Bypass 1980s Bypass 1960-70s Bypass

Study Avg. Avg. all Iowa cities

Indexed on FY 1989 = 1.0

Future Bypass

Bloomfield


Study Conclusions

• Every community thought that the bypass had been beneficial, especially for removing trucks/through traffic, & improving safety and the quality of life.

• Those towns that benefited most planned for changes or took advantage of new situations & opportunities.

• Working with DOT can help to achieve best results/orientation of the bypass to benefit town.

• Population was unaffected.

• In larger communities, traffic on “old route” is increasing (& generally higher volumes than on the bypass). Retail sales and city valuations are generally not negatively impacted.

• Safety, noise, etc. is improved in neighboring streets.

• Bypasses play a small role in overall economic vitality: regional & ag. economy, commuting, urbanization, access to regional highways, etc. all more important.

Preliminary 1999 Iowa Bypass Study

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Transcript of Preliminary 1999 Iowa Bypass Study