The economic well-being of the United States is dependent on the reliability, safety, and security of its physical infrastructure. The nation’s infrastructure is vast and affects the daily lives of virtually all Americans. In total, there are about 4 million miles of roads, 117,000 miles of rail, 600,000 bridges, 79,000 dams, 26,000 miles of commercially navigable waterways, 11,000 miles of transit lines, 500 train stations, 300 ports, 19,000 airports, 55,000 community drinking water systems, and 30,000 wastewater treatment and collection facilities. Collectively, this infrastructure connects communities, facilitates trade, provides clean drinking water, and protects public health, among other things. The nation’s infrastructure is primarily owned and operated by state and local governments and the private sector. For example, state and local governments own about 98 percent of the nation’s bridges and the private sector owns almost all freight railroad infrastructure. The federal government owns a limited amount of infrastructure—for instance, the federal government owns and operates the nation’s air traffic control infrastructure. In addition, through its oversight role, the federal government plays an important role in ensuring the safety, security, and reliability of the nation’s infrastructure. Table 1 provides information on infrastructure ownership. Funding for the nation’s infrastructure comes from a variety of federal, state, local, and private sources. For example, the private and local public owners of water infrastructure as well as multiple federal agencies fund drinking water and wastewater capital improvements. As owners of the infrastructure, state and local governments and the private sector generally account for a larger share of funding for infrastructure than the federal government. However, the federal government has played and continues to play an important role in funding infrastructure. For example: From 1954 through 2001, the federal government invested over $370 billion (in 2001 dollars) in the Interstate Highway System. Federal Airport Improvement Program grants provided an average of $3.6 billion annually (in 2006 dollars) for airport capital improvements between 2001 and 2005. From fiscal year 1991 through fiscal year 2000, nine federal agencies provided about $44 billion (in 2000 dollars) for drinking water and wastewater capital improvements. Through the New Starts program, the federal government provided over $10 billion in capital funds for new fixed-guideway transit (e.g., commuter rail and subway) projects between fiscal year 1998 and fiscal year 2007. To increase the nation’s long-term productivity and growth, the federal government invests in various activities and sectors, including infrastructure.While providing long-term benefits to the nation as a whole, much of this spending does not result in federal ownership of the infrastructure assets. For the most part, the federal government supports infrastructure investments through federal subsidies to other levels of government or the private sector. To address concerns about the state of the nation’s infrastructure, Members of Congress have introduced several bills that are intended to increase investment in the nation’s infrastructure by, for example, issuing bonds and providing tax credits for infrastructure investments. (See table 2.) Congress previously established two commissions to study the condition and future needs of the surface transportation system, including financing options. It created the National Surface Transportation Policy and Revenue Study Commission (Policy Commission) to examine the condition and future needs of the nation’s surface transportation system and short- and long-term alternatives to replace or supplement the fuel tax as the principal revenue source supporting the Highway Trust Fund. In January 2008, the Policy Commission released its final report. Congress also created the National Surface Transportation Infrastructure Financing Commission and charged it with analyzing future highway and transit needs and the finances of the Highway Trust Fund and with recommending alternative approaches to financing transportation infrastructure. This commission issued its interim report in February 2008, and its final report is expected in November 2008. We have previously reported that the nation’s surface transportation, aviation, water, and dam systems face numerous challenges related to their infrastructure. Increasing congestion has strained the capacity of our nation’s surface transportation and aviation systems, decreasing their overall performance in meeting the nation’s mobility needs. Furthermore, significant investments are needed in our nation’s drinking and wastewater systems to address deteriorating infrastructure and deferred maintenance. In light of these and other challenges, we have called for a fundamental reexamination of government programs and developed a set of principles that could help guide such a reexamination. Despite increases in transportation spending at all levels of government and improvements to the physical condition of highways and transit facilities over the past 10 years, congestion has worsened and safety gains have leveled off. For example, according to DOT, highway spending by all levels of government has increased 100 percent in real dollar terms since 1980, but the hours of delay during peak travel periods have increased almost 200 percent during the same period. In addition, demand has outpaced the capacity of the system, and projected population growth, technological changes, and increased globalization are expected to further strain the system. We have previously reported that federal surface transportation programs are not effectively addressing these key challenges because federal goals and roles are unclear, many programs lack links to needs or performance, and the programs may not employ the best tools and approaches.In addition, federal transportation funding is generally not linked to specific performance-related goals or outcomes, resulting in limited assurance that federal funding is being channeled to the nation’s most critical mobility needs. Federal funding is also often tied to a single transportation mode, which may limit the use of federal funds to finance the greatest improvements in mobility. To address these surface transportation challenges, various stakeholders have called for increasing significantly the level of investment by all levels of government in surface transportation. For example, in its January 2008 report, the Policy Commission recommended that all levels of government and the private sector collectively invest at least $225 billion each year to maintain and improve the surface transportation system, which would be about $140 billion more than is currently invested. However, without significant changes in funding, planned spending, or both, the balance of the Highway Account of the Highway Trust Fund—the major source of federal highway funds—is projected to be exhausted at some point during fiscal year 2009. To address this gap between revenues and spending, in its fiscal year 2009 budget request, the administration proposed granting the Secretary of the Treasury, in consultation with the Secretary of Transportation, the flexibility to transfer funds between the Highway and Transit Accounts of the Highway Trust Fund. However, this solution, if enacted, would provide only a short-term reprieve—both the administration and the Congressional Budget Office project that the balances of the Highway and Transit Accounts would be exhausted by the end of fiscal year 2010. The Federal Aviation Administration (FAA) faces significant challenges in keeping the nation’s current airspace system running as efficiently as possible as the demand for air travel increases and the air traffic control system ages. System congestion, and the resulting flight delays and cancellations, are serious problems that have worsened in recent years. For example, according to DOT, 2007 was the second-worst year for delays since 1995. To accommodate current and expected demand for air travel, FAA and aviation stakeholders are developing the Next Generation Air Transportation System (NextGen) to modernize the nation’s air traffic control infrastructure and increase capacity. This effort is complex and costly. Although there is considerable uncertainty about how much NextGen will cost, FAA estimates that NextGen infrastructure will cost the federal government between $15 billion and $22 billion through 2025. Other key challenges for FAA include managing a timely acquisition and implementation of NextGen and dealing effectively with the environmental concerns of communities that are adjacent to airports or under the flight paths of arriving and departing aircraft. For example, as we have previously testified, if not adequately addressed, these concerns, particularly about the noise that affects local communities and the emissions that contribute to global warming, may constrain efforts to build or expand the runways and airports needed to handle the added capacity envisioned for NextGen. In addition, airports face similar funding challenges in attempting to expand their capacity. For example, planned airport development costs total at least $14 billion annually (in 2006 dollars) through 2011—exceeding historical funding levels by about $1 billion per year. We have previously testified that FAA’s current funding mechanisms—the Airport and Airway Trust Fund (Trust Fund) and the U.S. Treasury’s general fund—can potentially provide sufficient resources to support FAA activities, including NextGen.However, there are a number of uncertainties—including the future cost of NextGen investment, the volume of air traffic, the future costs of operating the National Airspace System, and the levels of future appropriations for the Airport Improvement Program—that may influence the funding necessary to support FAA’s activities. In addition, uncertainties surrounding the status of FAA’s reauthorization could have adverse effects on FAA’s ability to carry out its mission unless other revenue sources and spending authority are provided. Without legislative action, both the excise taxes that fund the Trust Fund and FAA’s authority to spend from the Trust Fund will expire on June 30, 2008. Failing to meet these infrastructure challenges in aviation may have significant economic consequences, since aviation is an integral part of the economy. Water utilities nationwide are under increasing pressure to make significant investments to upgrade aging and deteriorating infrastructures, improve security, serve a growing population, and meet new regulatory requirements.Water infrastructure needs across the country are estimated to range from $485 billion to nearly $1.2 trillion over the next 20 years. According to the Environmental Protection Agency’s (EPA) June 2005 Drinking Water Infrastructure Needs Survey, the largest category of need is the installation and maintenance of transmission and distribution systems—accounting for $183.6 billion, or about 66 percent of the needs projected through 2022. For wastewater systems, EPA’s 2004 Clean Watersheds Needs Survey projected infrastructure-related needs for publicly owned wastewater systems of $202.5 billion through 2024.Many drinking water and wastewater utilities have had difficulty raising funds to repair, replace, or upgrade aging capital assets; comply with regulatory requirements; and expand capacity to meet increased demand. For example, based on a nationwide survey of several thousand drinking water and wastewater utilities, we reported in 2002 that about one-third of the utilities (1) deferred maintenance because of insufficient funds, (2) had 20 percent or more of their pipelines nearing the end of their useful life, and (3) lacked basic plans for managing their capital assets.Other GAO work suggests that the nation’s water utilities could more effectively manage their infrastructure at a time when significant investments are needed. Several factors have contributed to the nation’s deteriorating water infrastructure over the years. The adequacy of available funds, in particular, has been a key determinant of how well utility infrastructure has been maintained. However, according to our nationwide survey, a significant percentage of the utilities serving populations of 10,000 or more—29 percent of the drinking water utilities and 41 percent of the wastewater utilities—were not generating enough revenue from user charges and other local sources to cover their full costs of service. In addition, when asked about the frequency of rate increases during the period from 1992 to 2001, more than half the utilities reported raising their rates infrequently: once, twice, or not at all over the 10-year period. Citing communities’ funding difficulties, many have looked to the federal government for financial assistance. However, if budgetary trends over the past few years serve as any indication, federal funding will not close the gap. For example, the trends and overall funding levels associated with the Clean Water and Drinking Water State Revolving Funds, the key federal programs supporting water infrastructure financing, suggest that they will have only a marginal impact in closing the long-term water infrastructure funding gap. We have previously reported that comprehensive asset management, a technique whereby water systems systematically identify their needs, set priorities, and better target their investments, can help utilities make better us of available funds. Additional funds, however, will ultimately be needed to narrow the funding gap. Our nation’s dam infrastructure is an important component of the nation’s water control infrastructure, supplying such benefits as water for drinking, irrigation, and industrial uses; flood control; hydroelectric power; recreation; and navigation. However, as evidenced by the events of Hurricanes Katrina and Rita, the failure of dam infrastructure, which includes levees, also represents a risk to public safety, local and regional economies, and the environment. In particular, the aging of dam infrastructure in the United States continues to be a critical issue for dam safety because the age of dams is a leading indicator of potential dam failure.According to the American Society of Civil Engineers, the number of unsafe dams has risen by more than 33 percent since 1998, to more than 3,500 in 2005.In addition, the number of dams identified as unsafe is increasing faster than the number of dams that are being repaired. To address the challenges facing our nation’s dams, the Federal Emergency Management Agency and the National Dam Safety Review Board identified both short- and long-term goals and priorities for the National Dam Safety Program over the next 5 to 10 years. They include identifying and remedying deficient dams, increasing dam inspections, increasing the number of and updating of Emergency Action Plans, achieving the participation of all states in the National Dam Safety Program, increasing research products disseminated to the dam safety community, and achieving cost efficiencies. However, according to the Congressional Research Service, most federal agencies do not have funding available to immediately undertake all nonurgent repairs, and at some agencies, dam rehabilitation projects must compete for funding with other construction projects. The Association of State Dam Safety Officials reported similar funding constraints on dam investment at the state level. Given the nation’s infrastructure challenges and the federal government’s fiscal outlook, we have called for a fundamental reexamination of government programs. Addressing these challenges requires strategic approaches, effective tools and programs, and coordinated solutions involving all levels of government and the private sector. Yet in many cases, the government is still trying to do business in ways that are based on conditions, priorities, and approaches that were established decades ago and are not well suited to addressing 21st century challenges. A reexamination offers an opportunity to address emerging concerns by eliminating outdated or ineffective programs, more sharply defining the federal role in relation to state and local roles, and modernizing those programs and policies that remain relevant. Through our prior analyses of existing programs, we identified a number of principles that could help drive an assessment for restructuring and financing the federal surface transportation program. While these principles are designed specifically to reexamine the surface transportation programs, most, if not all of these principles could be informative as policymakers consider how to address challenges facing other federal infrastructure programs. These principles include creating well-defined goals based on identified areas of national interest, which involves examining the relevance and relative priority of existing programs in light of 21st century challenges and identifying emerging areas of national importance; establishing and clearly defining the federal role in achieving each goal in relation to the roles of state and local governments, regional entities, and the private sector; incorporating performance and accountability into funding decisions to ensure resources are targeted to programs that best achieve intended outcomes and national priorities; employing the best tools, such as benefit-cost analysis, and approaches to emphasize return on investment at a time of constrained federal resources; and ensuring fiscal sustainability through targeted investments of federal, state, local, and private resources. Various options exist or have been proposed to fund investments in the nation’s infrastructure. These options include altering existing or introducing new funding approaches and employing various financing mechanisms. In addition, some have suggested including an infrastructure component in a future economic stimulus bill, which could provide a one- time infusion of funds for infrastructure. Each of these options has different merits and challenges, and the selection of any of them will likely involve trade-offs among different policy goals. Furthermore, the suitability of any of these options depends on the level of federal involvement or control that policymakers desire for a given area of policy. However, as we have reported, when infrastructure investment decisions are made based on sound evaluations, these options can lead to an appropriate blend of public and private funds to match public and private costs and benefits. To help policymakers make explicit decisions about how much overall federal spending should be devoted to infrastructure investment, we have previously proposed establishing an investment component within the unified budget. Various existing funding approaches could be altered or new funding approaches could be developed to help fund investments in the nation’s infrastructure. These various approaches can be grouped into two categories: taxes and user fees. A variety of taxes have been and could be used to fund the nation’s infrastructure, including excise, sales, property, and income taxes. For example, federal excise taxes on motor fuels are the primary source of funding for the federal surface transportation program. Fuel taxes are attractive because they have provided a relatively stable stream of revenues and their collection and enforcement costs are relatively low. However, fuel taxes do not currently convey to drivers the full costs of their use of the road—such as the costs of wear and tear, congestion, and pollution. Moreover, federal motor fuel taxes have not been increased since 1993—and thus the purchasing power of fuel taxes revenues has eroded with inflation. As Congressional Budget Office (CBO) has previously reported, the existing fuel taxes could be altered in a variety of ways to address this erosion, including increasing the per-gallon tax rate and indexing the rates to inflation. Some transportation stakeholders have suggested exploring the potential of using a carbon tax, or other carbon pricing strategies, to help fund infrastructure. In a system of carbon taxes, fossil fuel emissions would be taxed, with the tax proportional to the amount of carbon dioxide released in the fuel’s combustion. Because a carbon tax could have a broad effect on consumer decisions, we have previously reported that it could be used to complement Corporate Average Fuel Economy standards, which require manufacturers meet fuel economy standards for passenger cars and light trucks to reduce oil consumption. A carbon tax would create incentives that could affect a broader range of consumer choices as well as provide revenue for infrastructure. Another funding source for infrastructure is user fees. The concept underlying user fees—that is, users pay directly for the infrastructure they use—is a long-standing aspect of many infrastructure programs. Examples of user fees that could be altered or introduced include airport passenger facility charges; fees for use of air traffic control services; fees based on vehicle miles traveled (VMT) on roadways; freight fees, such as a per- container charge; highway tolls; and congestion pricing of roads and aviation infrastructure. Aviation user fees. Many commercial airports currently impose a user fee on passengers—referred to as a passenger facility charge—to fund airport capital projects. Over $2 billion in passenger facility charge revenues are collected by airports each year, representing an important source of funding for airport capital projects. In contrast, FAA’s activities, including the transition to NextGen, are largely funded by excise taxes through the Airport and Airway Trust Fund. To better connect FAA’s revenues with the cost of air traffic control services that FAA provides, the administration has proposed, in its FAA reauthorization bill, to replace this excise tax funding system with a cost-based user fee system. This new system would aim to recover the costs of providing air traffic control services through user fees for commercial operators and aviation fuel taxes for general aviation. According to the administration, cost-based user charges would link revenues more closely to costs and could create incentives for more efficient use of the system by aircraft operators. We have previously testified that a better alignment of FAA’s revenues and costs can address concerns about long-term revenue adequacy, equity, and efficiency as intended, but the ability of the proposed funding structure to link revenues and costs depends critically on the soundness of FAA’s cost allocation system in allocating costs to users. We found that the support for some of FAA’s cost allocation methodology’s underlying assumptions and methods is insufficient, leaving FAA unable to conclusively demonstrate the reasonableness of the resulting cost assignments. VMT fees. To more directly reflect the amount a vehicle uses particular roads, users could be charged a fee based on the number of vehicle miles traveled. In 2006, the Oregon Department of Transportation conducted a pilot program designed to test the technological and administrative feasibility of a VMT fee. The pilot program evaluated whether a VMT fee could be implemented to replace motor fuel taxes as the principal source of transportation revenue by utilizing a Global Positioning System (GPS) to track miles driven and collecting the VMT fee ($0.012 per mile traveled) at fuel pumps that can read information from the GPS. As we have previously reported, using a GPS could also be used to track mileage in high-congestion zones, and the fee could be adjusted upward for miles driven in these areas or during more congested times of day such as rush hour—a strategy that might reduce congestion and save fuel.In addition, the system could be designed to apply different fees to vehicles, depending on their fuel economy. On the federal level, a VMT fee could be based on odometer readings, which would likely be a simpler and less costly way to implement such a program. A VMT fee—unless it is adjusted based on the fuel economy of the vehicle—does not provide incentives for customers to buy vehicles with higher fuel economy ratings because the fee depends only on mileage. Also, because the fee would likely be collected from individual drivers, a VMT fee could be expensive for the government to implement, potentially making it a less cost-effective approach than a motor fuel or carbon tax. The Oregon study also identified other challenges including concerns about privacy and technical difficulties in retrofitting vehicles with the necessary technology. Freight fees. Given the importance of freight movement to the economy, the Policy Commission recently recommended a new federal freight fee to support the development of a national program aimed at strategically expanding capacity for freight transportation. While the volume of domestic and international freight moving through the country has increased dramatically and is expected to continue growing, the capacity of the nation’s freight transportation infrastructure has not increased at the same rate as demand. To support the development of a national program for freight transportation, the Policy Commission recently recommended the introduction of a federal freight fee. The Policy Commission notes that a freight fee, such as a per-container charge, could help fund projects that remedy chokepoints and increase throughput. The Policy Commission also recommended that a portion of the customs duties, which are assessed on imported goods, be used to fund capacity improvements for freight transportation. The majority of customs duties currently collected, however, are deposited in the U.S. Treasury’s general fund for the general support of federal activities.Therefore, designating a portion of customs duties for surface transportation financing would not create a new source of revenue, but rather transfer funds from the general fund. Tolling. We have previously reported that roadway tolling has the potential to provide new revenues, promote more effective and rational investment strategies, and better target spending for new and expanded capacity for surface transportation infrastructure. For example, the construction of toll projects is typically financed by bonds; therefore, projects must pass the test of market viability and meet goals demanded by investors, although even with this test, there is no guarantee that projects will always be viable. Tolling potentially can also leverage existing revenue sources by increasing private-sector participation and investment through such arrangements as public-private partnerships. However, securing public and political support for tolling can prove difficult when the public and political leaders perceive tolling (1) as a form of double taxation, (2) unreasonable because tolls do not usually cover the full costs of projects, or (3) unfair to certain groups. Other challenges include obtaining sufficient statutory authority to toll, adequately addressing the traffic diversion that might result when motorists seek to avoid toll facilities, limitations on the types of roads that can be tolled, and coordinating with other states or jurisdictions on a tolling project. Congestion pricing. As we have previously reported, congestion pricing, or road pricing, attempts to influence driver behavior by charging fees during peak hours to encourage users to shift to off-peak periods, use less congested routes, or use alternative modes. Congestion pricing can also help guide capital investment decisions for new transportation infrastructure. In particular, as congestion increases, tolls also increase, and such increases (sometimes referred to as “congestion surcharges”) signal increased demand for physical capacity, indicating where capital investments to increase capacity would be most valuable. Furthermore, these congestion surcharges can potentially enhance mobility by reducing congestion and the demand for roads when the surcharges vary according to congestion to maintain a predetermined level of service. The most common form of congestion pricing in the United States is high- occupancy-toll lanes, which are priced lanes that offer drivers of vehicles that do not meet the occupancy requirements the option of paying a toll to use lanes that are otherwise restricted for high-occupancy vehicles. In its FAA reauthorization proposal, the administration proposed extending congestion pricing to the aviation sector as a means of managing air traffic congestion. Specifically, the administration proposed that FAA establish a fee based on time of day or day of the week for aircraft using the nation’s most congested airports to discourage peak-period traffic. Under such a fee, cargo carriers could pay lower fees by operating at night than they would pay by operating at peak periods of the day, creating an incentive for some cargo carriers to switch daytime operations to nighttime. Like tolling, congestion pricing proposals often arouse political and public opposition, raise equity concerns, and face statutory restrictions. Financing strategies can provide flexibility for all levels of government when funding additional infrastructure projects, particularly when traditional pay-as-you-go funding approaches, such as taxes or fees, are not set at high enough levels to meet demands. The federal government currently offers several programs to provide state and local governments with incentives such as bonds, loans, and credit assistance to help finance infrastructure. Financing mechanisms can create potential savings by accelerating projects to offset rapidly increasing construction costs and offer incentives for investment from state and local governments and from the private sector. However, each financing strategy is, in the final analysis, a form of debt that ultimately must be repaid with interest. Furthermore, since the federal government’s cost of capital is lower than that of the private sector, financing mechanisms, such as bonding, may be more expensive than timely, full, and up-front appropriations. Finally, if the federal government chooses to finance infrastructure projects, policy makers must decide how borrowed dollars will be repaid, either by users or by the general population either now or in the future through increases in general fund taxes or reductions in other government services. A number of available mechanisms can be used to help finance infrastructure projects. Examples of these financing mechanisms follow: Bonding. A number of bonding strategies—including tax-exempt bonds, Grant Anticipation Revenue Vehicles (GARVEE) bonds, and Grant Anticipation Notes (GAN)—offer flexibility to bridge funding gaps when traditional revenue sources are scarce. For example, state-issued GARVEE bonds or GANs provide capital in advance of expected federal funds, allowing states to accelerate highway and transit project construction and thus potentially reduce construction costs. Through April 2008, 20 states and two territories issued approximately $8.2 billion of GARVEE-type debt financing and 20 other states are actively considering bonding or seeking legislative authority to issue GARVEEs. Further, SAFETEA-LU authorized the Secretary of Transportation to allocate $15 billion in private activity bonds for qualified highway and surface freight transfer facilities. To date, $5.3 billion has been allocated for six projects. In aviation, most commercial airports issue a variety of bonds for airport capital improvements, most notably general revenue bonds that are backed by general revenues from the airport—including aircraft landing fees, concessions, and parking fees—and passenger facility charges. Several bills introduced in this Congress would increase investment in the nation’s infrastructure through bonding. For example, the Build America Bonds Act would provide $50 billion in new infrastructure funding through bonding. Although bonds can provide up-front capital for infrastructure projects, they can be more expensive for the federal government than traditional federal grants. This higher expense results, in part, because the government must compensate the investors for risks they assumed through an adequate return on their investment. Loans, loan guarantees, and credit assistance. The federal government currently has two programs designed to offer credit assistance to states for surface transportation projects. The Transportation Infrastructure Finance and Innovation Act of 1998 (TIFIA) authorized FHWA to provide credit assistance, in the form of direct loans, loan guarantees, and standby lines of credit for projects of national significance. A similar program, Railroad Rehabilitation and Improvement Financing (RRIF) offers loans to acquire, improve, develop, or rehabilitate intermodal or rail equipment or facilities. To date, 15 TIFIA projects have been approved for a total of about $4.8 billion in credit assistance and the RRIF program has approved 21 loan agreements worth more than $747 million. These programs are designed to leverage federal funds by attracting substantial nonfederal investments in infrastructure projects. However, the federal government assumes a level of risk when it makes or guarantees loans for projects financed with private investment. Revolving funds. Revolving funds can be used to dedicate capital to be loaned for qualified infrastructure projects. In general, loaned dollars are repaid, recycled back into the revolving fund, and subsequently reinvested in the infrastructure through additional loans. Such funds exist at both the federal and the state levels and are used to finance various infrastructure projects ranging from highways to water mains. For example, two federal funds support water infrastructure financing, the Clean Water State Revolving Fund (CWSRF) for wastewater facilities, and the Drinking Water State Revolving Fund (DWSRF) for drinking water facilities. Under each of these programs, the federal government provides seed money to states, which they supplement with their own funds. These funds are then loaned to local governments and other entities for water infrastructure construction and upgrades and various water quality projects. In addition, State Infrastructure Banks (SIB)—capitalized with federal and state matching funds—are state-run revolving funds, make loans and provide credit enhancements and other forms of nongrant assistance to infrastructure projects. Through June 2007, 33 SIBs have made approximately 596 loan agreements worth about $6.2 billion to leverage other available funds for transportation projects across the nation. Furthermore, other funds—such as a dedicated national infrastructure bank—have been proposed to increase investment in infrastructure with a national or regional significance. A challenge for revolving funds in general is maintaining their capitalized value. Defaults on loans and inflation can reduce the capitalized value of the fund—necessitating an infusion of capital to continue the fund’s operations. Another option proposed for temporarily increasing investment in the nation’s infrastructure is including an investment component in a future economic stimulus bill. According to supporters, including funding for “ready to build” infrastructure projects in a stimulus bill would serve to both boost the economy and improve the nation’s infrastructure through a one-time infusion of funds. For example, the American Association of State Highway and Transportation Officials estimates 42,000 jobs are created for every $1 billion dollars invested in transportation projects. We have previously identified important design criteria for any economic stimulus package. Specifically: Economic stimulus package should be timely. An economic stimulus should not be enacted prematurely, delayed too long, or consist of programs that would take too long to be implemented to lessen any economic downturn. For example, if fiscal stimulus is undertaken when it is not needed, it could result in higher inflation or if fiscal stimulus is enacted too slowly, it could take effect after the economy has already started to recover. Economic stimulus package should be temporary. An economic stimulus should be designed to raise output in the short run, but should not increase the budget deficit in the long-run. If a stimulus program is not temporary and continues after the economy recovers, it could lead to higher inflation. Economic stimulus package should be targeted. An economic stimulus should be targeted to areas that are most vulnerable in a weakening economy and should generate the largest possible increase in short-run gross domestic product. Designing and implementing an economic stimulus package with an infrastructure investment component that is timely, temporary, and targeted would be difficult. First, while an effective stimulus package should be timely, practically speaking, infrastructure projects require lengthy planning and design periods. According to CBO, even those projects that are “on the shelf” generally cannot be undertaken quickly enough to provide a timely stimulus to the economy.Second, spending on infrastructure is generally not temporary because of the extended time frames needed to complete projects. For example, initial outlays for major infrastructure projects supported by the federal government, such as highway construction, often total less than 25 percent of the total funding provided for the project. Furthermore, the initial rate of spending can be significantly lower than 25 percent for large projects. Third, because of differences among states, it is challenging to target stimulus funding to areas with the greatest economic and infrastructure needs. For example, two possible indicators for targeting infrastructure aid to states, gross state product and lane miles per capita, are not correlated. Furthermore, as we have previously reported, states tend to substitute federal funds for funds they would have otherwise spent—making it difficult to target a stimulus package so that it results in a dollar-for-dollar increase in infrastructure investment. We have previously reported that the budget process can favor consumption over investment because the initial cost of an infrastructure project looks high in comparison to consumption spending.Thus, adopting a capital budget is suggested as a way to eliminate a perceived bias against investments requiring large up-front spending when they compete with other programs in a unified budget. However, proposals to adopt a capital budget at the federal level often start with certain concepts and models extended from state and local governments and the private sector, which are not appropriate because of fundamental differences in the role of the federal government. Specifically, when state and local governments and the private sector make investments, they typically own the resulting assets, while this is frequently not the case for the federal government. For example, although the federal government invests in surface transportation, aviation, water, and dam infrastructure, a significant portion of this infrastructure is owned by state and local governments. This makes it difficult to fully apply traditional capital budgeting approaches, such as depreciation, which might be considered when assets are fully owned. Moreover, there are fundamental differences between the roles of the state and local governments and the federal government. In an inclusive, unified budget, it is important to disclose up front the full commitments of the government. Federal fiscal policy, as broadly conceived, plays a key role in managing the short-term economy as well as promoting the savings needed for long-term growth. Rather than recommend adopting a capital budget, we have previously proposed establishing an investment component within the unified budget to address federal spending intended to promote the nation’s long-term economic growth.By recognizing the different effects of various types of federal spending, an investment focus within the budget would provide a valuable supplement to the unified budget’s concentration on macroeconomic issues. Moreover, it would direct attention to the consequences of choices within the budget under existing budget limitations—a level which is now not determined explicitly by policymakers but is simply the result of numerous individual decisions. If an investment component within the unified budget was adopted, Congress could decide on an overall level of investment in a budget resolution or other macro framework, which would be tracked and enforced through the authorizing and appropriations process to ensure that individual appropriations actions supported the overall level. This approach has the advantage of focusing budget decision makers on the overall level of investment supported in the budget without losing sight of the unified budget’s effect on the economy. It also has the advantage of building on the current congressional budget process. Finally, it does not raise the problems posed by capital budgeting proposals that use depreciation and deficit financing. Although the investment component would be subject to budget controls, the existence of a separate component could create an incentive to categorize many proposals as investment. If an investment component within the budget is to be implemented in a meaningful fashion, it will be important to identify what to include. Any changes in the budgetary treatment of investment need to consider broader federal responsibilities. While well-chosen investments may contribute to long-term growth, financing such programs through deficits would undermine their own goal by reducing savings available to fund private investment.Accordingly, reforms in the federal government’s budget for investment should be considered within the overall constraints of fiscal policy based on unified budget principles. The nation’s physical infrastructure is under strain, raising a host of safety, security, and economic concerns. Given these concerns, various investment options have been, and likely will continue to be, identified to help repair, upgrade, and expand our nation’s infrastructure. Ultimately, Congress and other federal policymakers will have to determine which option—or, more likely, which combination of funding and financing options—best meets the needs of the nation. There is no silver bullet. Moreover, although financing mechanisms allow state and local governments to advance projects when traditional pay-as-you-go funding approaches, such as taxes and fees, are insufficient, ultimately these borrowed dollars must be repaid by the users or the general population. Consequently, prudent decisions are needed to determine the appropriate level of infrastructure investment and to maximize each dollar invested. We will continue to assist the Congress as it works to evaluate various investment options and develop infrastructure policies for the 21st century. Messrs. Chairmen, this concludes my prepared statement. I would be pleased to respond to any questions that you or other Members of the Committee might have. For further information on this statement, please contact Patricia Dalton at (202) 512-2834 or daltonp@gao.gov. Individuals making key contributions to this testimony were Kyle Browning, Nikki Clowers, Steve Elstein, JayEtta Hecker, Carol Henn, Bert Japikse, Barbara Lancaster, Matthew LaTour, Nancy Lueke, and Katherine Siggerud. Drinking Water: The District of Columbia and Communities Nationwide Face Serious Challenges in Their Efforts to Safeguard Water Supplies. GAO-08-687T. Washington, D.C.: April 15, 2008. Surface Transportation: Restructured Federal Approach Needed for More Focused, Performance-Based, and Sustainable Programs. GAO-08-400. Washington, D.C.: March 6, 2008. Highway Public-Private Partnerships: More Rigorous Up-front Analysis Could Better Secure Potential Benefits and Protect the Public Interest. GAO-08-44. Washington, D.C.: February 8, 2008. Federal Aviation Administration: Challenges Facing the Agency in Fiscal Year 2009 and Beyond. GAO-08-460T. Washington, D.C.: February 7, 2008. Surface Transportation: Preliminary Observations on Efforts to Restructure Current Program. GAO-08-478T. Washington, D.C.: February 6, 2008. Long-Term Fiscal Outlook: Action Is Needed to Avoid the Possibility of a Serious Economic Disruption in the Future. GAO-08-411T. Washington, D.C.: January 29, 2008. Freight Transportation: National Policy and Strategies Can Help Improve Freight Mobility. GAO-08-287. Washington, D.C.: January 7, 2008. A Call For Stewardship: Enhancing the Federal Government’s Ability to Address Key Fiscal and Other 21st Century Challenges. GAO-08-93SP. Washington, D.C.: December 17, 2007. Transforming Transportation Policy for the 21st Century: Highlights of a Forum. GAO-07-1210SP. Washington, D.C.: September 19, 2007. Railroad Bridges and Tunnels: Federal Role in Providing Safety Oversight and Freight Infrastructure Investment Could Be Better Targeted. GAO-07-770. Washington, D.C.: August 6, 2007. Vehicle Fuel Economy: Reforming Fuel Economy Standards Could Help Reduce Oil Consumption by Cars and Light Trucks, and Other Options Could Complement These Standards. GAO-07-921. Washington, D.C.: August 2, 2007. Public Transportation: Future Demand Is Likely for New Starts and Small Starts Programs, but Improvements Needed to the Small Starts Application Process. GAO-07-917. Washington, D.C.: July 27, 2007. Surface Transportation: Strategies Are Available for Making Existing Road Infrastructure Perform Better. GAO-07-920. Washington, D.C.: July 26, 2007. Highway and Transit Investments: Flexible Funding Supports State and Local Transportation Priorities and Multimodal Planning. GAO-07-772. Washington, D.C.: July 26, 2007. Intermodal Transportation: DOT Could Take Further Actions to Address Intermodal Barriers. GAO-07-718. Washington, D.C.: June 20, 2007. Federal Aviation Administration: Observations on Selected Changes to FAA’s Funding and Budget Structure in the Administration’s Reauthorization Proposal. GAO-07-625T. Washington, D.C.: March 21, 2007. Performance and Accountability: Transportation Challenges Facing Congress and the Department of Transportation. GAO-07-545T. Washington, D.C.: March 6, 2007. U.S. Infrastructure: Funding Trends and Opportunities to Improve Investment Decisions. GAO/RCED/AIMD-00-35. Washington, D.C.: February 7, 2007. High-Risk Series: An Update. GAO-07-310. Washington, D.C.: January 2007. Fiscal Stewardship: A Critical Challenge Facing Our Nation, GAO-07- 362SP. Washington, D.C.: January 2007. Intercity Passenger Rail: National Policy and Strategies Needed to Maximize Public Benefits from Federal Expenditures. GAO-07-15. Washington, D.C.: November 13, 2006. Freight Railroads: Industry Health Has Improved, but Concerns about Competition and Capacity Should Be Addressed. GAO-07-94. Washington, D.C.: October 6, 2006. Aviation Finance: Observations on Potential FAA Funding Options. GAO-06-973. Washington, D.C.: September 29, 2006. National Airspace System Modernization: Observations on Potential Funding Options for FAA and the Next Generation Airspace System. GAO-06-1114T. Washington, D.C.: September 27, 2006. Highway Finance: States’ Expanding Use of Tolling Illustrates Diverse Challenges and Strategies. GAO-06-554. Washington, D.C.: June 28, 2006. Highway Trust Fund: Overview of Highway Trust Fund Estimates. GAO-06-572T. Washington, D.C.: April 4, 2006. Highway Congestion: Intelligent Transportation Systems’ Promise for Managing Congestion Falls Short, and DOT Could Better Facilitate Their Strategic Use. GAO-05-943. Washington, D.C.: September 14, 2005. Freight Transportation: Short Sea Shipping Option Shows Importance of Systematic Approach to Public Investment Decisions. GAO-05-768. Washington, D.C.: July 29, 2005. Highlights of an Expert Panel: The Benefits and Costs of Highway and Transit Investments. GAO-05-423SP. Washington, D.C.: May 2005. 21st Century Challenges: Reexamining the Base of the Federal Government. GAO-05-325SP. Washington, D.C.: February 2005. Highway and Transit Investments: Options for Improving Information on Projects’ Benefits and Costs and Increasing Accountability for Results. GAO-05-172. Washington, D.C.: January 24, 2005. Federal-Aid Highways: Trends, Effect on State Spending, and Options for Future Program Design. GAO-04-802. Washington, D.C.: August 31, 2004. Surface Transportation: Many Factors Affect Investment Decisions. GAO-04-744. Washington, D.C.: June 30, 2004. Highways and Transit: Private Sector Sponsorship of and Investment in Major Projects Has Been Limited. GAO-04-419. Washington, D.C.: March 25, 2004. Water Infrastructure: Comprehensive Asset Management Has Potential to Help Utilities Better Identify Needs and Plan Future Investments. GAO-04-461. Washington, D.C.: March 19, 2004. Freight Transportation: Strategies Needed to Address Planning and Financing Limitations. GAO-04-165. Washington, D.C.: December 19, 2003. Marine Transportation: Federal Financing and a Framework for Infrastructure Investments. GAO-02-1033. Washington, D.C.: September 9, 2002. Water Infrastructure: Information on Financing, Capital Planning, and Privatization. GAO-02-764. Washington, D.C.: August 16, 2002. Budget Trends: Federal Investment Outlays, Fiscal Years 1981-2003. GAO/AIMD-98-184. Washington, D.C.: June 15, 1998. Budget Trends: Federal Investment Outlays, Fiscal Years 1981-2002, GAO/AIMD-97-88. Washington, D.C.: May 21, 1997. Budget Structure: Providing an Investment Focus in the Federal Budget. GAO/T-AIMD-95-178. Washington, D.C.: June 29, 1995. Budget Issues: Incorporating an Investment Component in the Federal Budget. GAO/AIMD-94-40. Washington, D.C.: November 9, 1993. 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Summary: Physical infrastructure is critical to the nation's economy and affects the daily life of virtually all Americans--from facilitating the movement of goods and people within and beyond U.S. borders to providing clean drinking water. However, this infrastructure--including aviation, highway, transit, rail, water, and dam infrastructure--is under strain. Estimates to repair, replace, or upgrade aging infrastructure as well as expand capacity to meet increased demand top hundreds of billions of dollars. Calls for increased investment in infrastructure come at a time when traditional funding for infrastructure projects is increasingly strained, and the federal government's fiscal outlook is worse than many may understand. This testimony discusses (1) challenges associated with the nation's surface transportation, aviation, water, and dam infrastructure, and the principles GAO has identified to help guide efforts to address these challenges and (2) existing and proposed options to fund investments in the nation's infrastructure. This statement is primarily based on a body of work GAO has completed for the Congress over the last several years. To supplement this existing work, GAO also interviewed Department of Transportation officials to obtain up-to-date information on the status of the Highway Trust Fund and various funding and financing options and reviewed published literature to obtain information on dam infrastructure issues. The nation faces a host of serious infrastructure challenges. Demand has outpaced the capacity of our nation's surface transportation and aviation systems, resulting in decreased performance and reliability. In addition, water utilities are facing pressure to upgrade the nation's aging and deteriorating water infrastructure to improve security, serve growing demands, and meet new regulatory requirements. Given these types of challenges and the federal government's fiscal outlook, it is clear that the federal government cannot continue with business as usual. Rather, a fundamental reexamination of government programs, policies, and activities is needed. Through prior analyses of existing programs, GAO identified a number of principles that could guide a reexamination of federal infrastructure programs. These principles include: (1) creating well-defined goals based on identified areas of national interest, (2) establishing and clearly defining the federal role in achieving each goal, (3) incorporating performance and accountability into funding decisions, (4) employing the best tools and approaches to emphasize return on investment, and (5) ensuring fiscal sustainability. Various options are available to fund infrastructure investments. These options include altering existing or introducing new funding approaches and employing various financing mechanisms, such as bonds and loans. For example, a variety of taxes and user fees, such as tolling, can be used to help fund infrastructure projects. In addition, some have suggested including an infrastructure component in a future economic stimulus bill, which could provide a one-time infusion of funds for infrastructure projects. Each of these options has different merits and challenges, and choosing among them will likely involve trade-offs among different policy goals. Furthermore, the suitability of the various options depends on the level of federal involvement or control that policymakers desire. However, as GAO has reported, when infrastructure investment decisions are made based on sound evaluations, these options can lead to an appropriate blend of public and private funds to match public and private costs and benefits. To help policymakers make explicit decisions about how much overall federal spending should be devoted to investment, GAO has previously proposed establishing an investment component within the unified budget.