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\textit{Top}: Position-velocity diagram of CO, NH$_3$, NH$_{3}$,  and HCO$^+$ emission for filament 3. Blue background shows $^{12}$CO (1-0) emission integrated between $-1 < \textrm{b} < 1$ degrees \citep{dame01}. \citep{Dame_2001}.  Black dots show HOPS, BGPS, and HOPS sources associated with filament 3. The black lines are fits to CO data for the Scutum-Centaurus arm, from \citet{dame01} \citet{Dame_2011}  and \citet{shane72}. \citet{Shane_1972}.  \textit{Bottom}: Plane of the sky map integrated between 55-75 km/s, the approximate velocity range of the Scutum-Centaurus arm in the region around Filament 3. A trace of Filament 3, as it would appear as a mid-IR extinction feature, is superimposed on the CO emission map. The correlation between Filament 3's mid-IR extinction feature and the Scutum-Centaurus***INVALID BYTE SEQUENCE HERE***s Scutum-Centaurus's  arm most intense CO emission hints that filament 3 may be a spine of Scutum as traced by lower density CO gas