I tend not to question water and wastewater treatment projected spending needs. Generally I wonder if it is underestimated. Schools, along the same lines. But transportation claimed needs I typically am suspicious of until I see each project. That area seems susceptible to manipulation by the contractors and their political influence.

House Joint Economic Committee Republican staff commentary March 2011 Spend Less, Owe Less, Grow the Economy
SPENDING REDUCTIONS TRUMP TAX INCREASES
HIGH TAXES ARE THE BANE OF ECONOMIC GROWTH

Households’ expectations of higher permanent disposable income create a wealth effect, which stimulates purchases of consumer durables and home buying thus driving up personal consumption expenditures and residential investment in the short term.
Businesses expecting higher after-tax returns boost their investment in non-residential fixed assets in the short term.
WHAT AND HOW TO CUT. Certain kinds of government spending reductions generate significantly larger pro-growth effects than others. For the “non-Keynesian” effects to be significant, government spending reductions must be viewed as large, credible, and politically difficult to reverse once made. Some examples are:
Decreasing the number and compensation of government workers. A smaller government workforce increases the available supply of educated, skilled workers for private firms, thus lowering labor costs.
Eliminating transfer payments to firms. Since government transfer payments entice firms to engage in otherwise unprofitable and unproductive activities, eliminating transfer payments will increase efficiency as firms cease these activities.
Eliminating agencies and programs.
Reforming and reducing transfer payments to households. Making major government programs, such as pension and health insurance benefits for the elderly, sustainably solvent will boost real GDP growth by (a) enhancing the credibility of fiscal consolidation plans, and (b) inducing younger workers to work more, save more, and retire later. This is true even if the reforms exempt current beneficiaries, are phased-in slowly, and any short-term spending reductions are very small.