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We present in this paper mid-infrared (5-8~$\mu$m) spectroscopy toward themassive young binary W3~IRS~5, using the EXES spectrometer in high-resolutionmode ($R\sim$50,000) from the NASA Stratospheric Observatory for InfraredAstronomy (SOFIA). Many ($\sim$180) $\nu_2$=1--0 and ($\sim$90) $\nu_2$=2-1absorption rovibrational transitions are identified. Two hot components over500 K and one warm component of 190 K are identified through Gaussian fittingsand rotation diagram analysis. Each component is linked to a CO componentidentified in the IRTF/iSHELL observations ($R$=88,100) through their kinematicand temperature characteristics. Revealed by the large scatter in the rotationdiagram, opacity effects are important, and we adopt two curve-of-growthanalyses, resulting in column densities of $\sim10^{19}$ cm$^{-2}$. In oneanalysis, the model assumes a foreground slab. The other assumes acircumstellar disk with an outward-decreasing temperature in the verticaldirection. The disk model is favored because fewer geometry constraints areneeded, although this model faces challenges as the internal heating source isunknown. We discuss the chemical abundances along the line of sight based onthe CO-to-H$_2$O connection. In the hot gas, all oxygen not locked in COresides in water. In the cold gas, we observe a substantial shortfall of oxygenand suggest that the potential carrier could be organics in solid ice.

High-resolution SOFIA/EXES Spectroscopy of Water Absorption Lines in the Massive Young Binary W3 IRS 5