Interstate Route Flow Map, 1994

Interstate Route Flow represented on this map are annual average daily traffic volumes between major traffic.

Interstate Route Flow Map, 1996

Interstate Route Flow represented on this map are annual average daily traffic volumes between major traffic.

Interstate Route Flow Map, 1998

Interstate Route Flow represented on this map are annual average daily traffic volumes between major traffic.

Interstate Route Flow Map, 2000

Interstate Route Flow represented on this map are annual average daily traffic volumes between major traffic.

Interstate Route Flow Map, 2002

Interstate Route Flow represented on this map are annual average daily traffic volumes between major traffic.

Interstate Route Flow Map, 2004

Interstate Route Flow represented on this map are annual average daily traffic volumes between major traffic.

Interstate Route Flow Map, 2006

Interstate Route Flow represented on this map are annual average daily traffic volumes between major traffic.

Interstate Route Flow Map, 2008

Interstate Route Flow represented on this map are annual average daily traffic volumes between major traffic.

US 30 Proposed Expansion Benton County, Iowa, Enviornmental Assessment and Section 4(f) De Minimis Impact Finding, June 11, 2012

The Transportation Equity Act of the 21st Century (TEA-21) (23 CFR) mandated environmental streamlining in order to improve transportation project delivery without compromising environmental protection. In accordance with TEA-21, the environmental review process for this project has been documented as a Streamlined Environmental Assessment (EA). This document addresses only those resources or features that apply to the project. This allowed study and discussion of resources present in the study area, rather than expend effort on resources that were either not present or not impacted. Although not all resources are discussed in the EA, they were considered during the planning process and are documented in the Streamlined Resource Summary, shown in Appendix A. The following table shows the resources considered during the environmental review for this project. The first column with a check means the resource is present in the project area. The second column with a check means the impact to the resource warrants more discussion in this document. The other listed resources have been reviewed and are included in the Streamlined Resource Summary.

Flow of Cases For Civil Rights Complaints,

Please note the following process describes handling employment, public accommodation, credit, or education cases. The process for housing complaints differs, from timelines to opportunities to seek judicial remedies.

Effects of urban development on the flood-flow characteristics of the Walnut Creek Basin, Des Moines Metropolitan area, Iowa,1978.

This report deals with the probable impact of urban development on the magnitude and frequency of flooding in the lower reach of the Walnut Creek Basin.

Rubber Buffings for Bridge Approach Expansion Joints, MLR-01-01, 2001

Many of the bridges in the state of Iowa have type ‘CF’, ‘EE’, or ‘EF’ expansion joints installed in the bridge approach slabs. These joints, which are typically 4” wide, are currently filled with a foam expansion joint material that is covered with a sealant. Over time the sealant begins to pull off of the walls of the joint and it ultimately fails. The joint, which is now exposed to the weather, is then filled with water and solids. The foam joint material, which is lighter than water, floats out of the joint onto the highway. This foam resembles a large 4” X 6” plank and poses a threat to motorists. A possible solution to this problem would be to replace the foam material with rubber buffings. Rubber buffings are a by-product of the tire retread industry.

Submerged Vanes for Flow Control and Bank Protection in Streams, HR-255, 1984

This study was conducted for the purpose of evaluating a new concept for a bank-protection structure: The Iowa Vane . The underlying idea involves countering the torque exerted on the primary flow by its curvature and vertical velocity gradient, thereby eliminating or significantly reducing the secondary flow and thus reducing the undermining of the outer banks and the high-velocity attack on it. The new structure consists of an array of short, vertical, submerged vanes installed with a certain orientation on the channel bed. A relatively small number of vanes can produce bend flows which are practically uniform across the channel. The height of the vanes is less than half the water depth, and their angle with the flow direction is of the order of l0 degrees. In this study, design relations have been established. The relations, and the vanes' overall performance, have been tested in a laboratory model under different flow and sediment conditions. The results are used for the design of an Iowa-Vane bank protection structure for a section of East Nishnabotna River along U.S. Highway 34 at Red Oak, Iowa.

Bridge Deck Expansion Assembly on Jefferson Street in Ottumwa, HR-505C, 1990

The objective of this research was to evaluate two experimental D.S. Brown, Type SL450 and one D.S. Brown, Type SL750 expansion assemblies to identify possible construction problems and to determine the long term performances. These joints were installed in Wapello County on Jefferson Street viaduct in Ottumwa, Iowa. Visual inspections were made yearly. There is an indication that there may be a slow leakage at all three joints. The joint assemblies have performed well.

Bridge Deck Expansion Assembly on I-380 in Waterloo, HR-505B, 1990

The objective of this research was to evaluate two experimental Acme MSB neoprene expansion assemblies to identify possible construction problems and to determine the long term performance. These joints were installed in Black Hawk County on the curved bridge of ramp H from US 218 to I-380 in Waterloo, Iowa. Visual inspections were made yearly. There is slow leakage at one joint and indication that there is some slow leakage of both joints. The joint assemblies have performed well.