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We present large-field (4.25~$\times$~3.75 deg$^2$) mapping observationstoward the Galactic region centered at $l = 150\arcdeg, b = 3.5\arcdeg$ in the$J = 1-0$ emission line of CO isotopologues ($^{12}$CO, $^{13}$CO, andC$^{18}$O), using the 13.7 m millimeter-wavelength telescope of the PurpleMountain Observatory. Based on the $^{13}$CO observations, we reveal afilamentary cloud in the Local Arm at a velocity range of $-$0.5 to6.5~km~s$^{-1}$. This molecular cloud contains 1 main filament and 11sub-filaments, showing the so-called "ridge-nest" structure. The main filamentand three sub-filaments are also detected in the C$^{18}$O line. The velocitystructures of most identified filaments display continuous distribution withslight velocity gradients. The measured median excitation temperature, linewidth, length, width, and linear mass of the filaments are $\sim$9.28~K,0.85~km~s$^{-1}$, 7.30~pc, 0.79~pc, and 17.92~$M_\sun$~pc$^{-1}$, respectively,assuming a distance of 400~pc. We find that the four filaments detected in theC$^{18}$O line are thermally supercritical, and two of them are in thevirialized state, and thus tend to be gravitationally bound. We identify intotal 146 $^{13}$CO clumps in the cloud, about 77$\%$ of the clumps aredistributed along the filaments. About 56$\%$ of the virialized clumps arefound to be associated with the supercritical filaments. Three young stellarobject (YSO) candidates are also identified in the supercritical filaments,based on the complementary infrared (IR) data. These results indicate that thesupercritical filaments, especially the virialized filaments, may containstar-forming activities.

CO~($J = 1-0$) Observations of a Filamentary Molecular Cloud in the Galactic Region Centered at $l = 150\arcdeg, b = 3.5\arcdeg$