An Illustrated Guide for Monitoring and Protecting Bridge Waterways Against Scour - Project TR-515 - Final Report, March 2006

This report is a well illustrated and practical Guide intended to aid engineers and engineering technicians in monitoring, maintaining, and protecting bridge waterways so as to mitigate or prevent scour from adversely affecting the structural performance of bridge abutments, piers, and approach road embankments. Described and illustrated here are the scour processes affecting the stability of these components of bridge waterways. Also described and illustrated are methods for monitoring waterways, and the various methods for repairing scour damage and protecting bridge waterways against scour. The Guide focuses on smaller bridges, especially those in Iowa. Scour processes at small bridges are complicated by the close proximity of abutments, piers, and waterway banks, such that scour processes interact in ways difficult to predict and for which reliable design relationships do not exist. Additionally, blockage by woody debris or by ice, along with changes in approach channel alignment, can have greater effects on pier and abutment scour for smaller bridges. These considerations tend to cause greater reliance on monitoring for smaller bridges. The Guide is intended to augment and support, as a source of information, existing procedures for monitoring bridge waterways. It also may prompt some adjustments of existing forms and reports used for bridge monitoring. In accord with increasing emphasis on effective management of public facilities like bridges, the Guide ventures to include an example report format for quantitative risk assessment applied to bridge waterways. Quantitative risk assessment is useful when many bridges have to be evaluated for scour risk and damage, and priorities need to be determined for repair and protection work. Such risk assessment aids comparison of bridges at risk. It is expected that bridge inspectors will implement the Guide as a concise, handy reference available back at the office. The Guide also likely may be implemented as an educational primer for new inspectors who have yet to become acquainted with waterway scour. Additionally, the Guide may be implemented as a part of process to check whether existing bridge-inspection forms or reports adequately encompass bridge-waterway scour.

Evaluation of Paver Vibrator Frequency Monitoring and Concrete Consolidation, HR-1068, 1999

Identification of ways to enhance consistency and proper entrained air content in hardened concrete pavement has long been a goal of state highway agencies and the Federal Highway Administration. The work performed in this study was done under FHWA Work Order No: DTFH71-97-PTP-IA-47 and referred to as Project HR-1068 by the Iowa DOT. The results of this study indicate that the monitoring devices do provide both the contractor and contracting authority and are a good way of controlling the consistent rate of vibration to achieve a quality concrete pavement product. The devices allow the contractor to monitor vibrator operation effectively and consistently. The equipment proved to be reliable under all weather and paver operating conditions. This type of equipment adds one more way of improving the consistency and quality of the concrete pavement.

Trends in Iowa Wildlife Populations and Harvest 2010, October 2011

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2011, October 2012

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2012, October 2013

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2013, December 2014

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2001, October 2002

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2002, September 2003

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2003, December 2004

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2004, October 2005

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2005, December 2006

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2006, December 2007

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2007, September 2008

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Trends in Iowa Wildlife Populations and Harvest 2008, September 2009

A report by the Iowa Department of Natural Resources on the trends of Iowa wildlife populations and harvest.

Iowa Conservation Reserve Enhancement Program, Helping Landowners Protect Iowa’s Natural Resources,January 2009

The Iowa Conservation Reserve Enhancement Program is a state, federal, local, and private partnership that provides incentives to landowners who voluntarily establish wetlands for water quality improvement in the tile-drained regions of Iowa. The goal of the program is to reduce nitrogen loads and movement of other agricultural chemicals from croplands to streams and rivers. In addition to improving water quality, these wetlands will provide wildlife habitat and increase recreational opportunities.