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We present an atlas and follow-up spectroscopic observations of 87 thinstream-like structures detected with the STREAMFINDER algorithm in Gaia DR3, ofwhich 29 are new discoveries. Here we focus on using these streams to refinemass models of the Galaxy. Fits with a double power law halo with the outerpower law slope set to $-\beta_h=3$ yield an inner power law slope$-\gamma_h=0.97^{+0.17}_{-0.21}$, a scale radius of $r_{0,h}=14.7^{+4.7}_{-1.0}$ kpc, a halo density flattening $q_{m, h}=0.75\pm0.03$,and a local dark matter density of $\rho_{h, \odot}=0.0114\pm0.0007 {\rmM_\odot pc^{-3}}$. Freeing $\beta$ yields $\beta=2.53^{+0.42}_{-0.16}$, butthis value is heavily influenced by our chosen virial mass limit. The stellardisks are found to have a combined mass of $4.20^{+0.44}_{-0.53}\times10^{10}{\rm M_\odot}$, with the thick disk contributing $12.4\pm0.7$\% to the localstellar surface density. The scale length of the thin and thick disks are$2.17^{+0.18}_{-0.08}$ kpc and $1.62^{+0.72}_{-0.13}$ kpc, respectively, whiletheir scale heights are $0.347^{+0.007}_{-0.010}$ kpc and$0.86^{+0.03}_{-0.02}$ kpc, respectively. The virial mass of the favored modelis $M_{200}=1.09^{+0.19}_{-0.14}\times 10^{12} {\rm M_\odot}$, while the massinside of 50 kpc is $M_{R<50}=0.46\pm0.03\times 10^{12} {\rm M_\odot}$. Weintroduce the Large Magellanic Cloud (LMC) into the derived potential models,and fit the "Orphan" stream therein, finding a mass for the LMC that isconsistent with recent estimates. Some highlights of the atlas include thenearby trailing arm of $\omega$-Cen, and a nearby very metal-poor stream thatwas once a satellite of the Sagittarius dwarf galaxy. Finally, we unambiguouslydetect a hot component around the GD-1 stream, consistent with it having beentidally pre-processed within its own DM subhalo.

Charting the Galactic acceleration field II. A global mass model of the Milky Way from the STREAMFINDER Atlas of Stellar Streams detected in Gaia DR3