  We report a trigonometric parallax measurement of 22 GHz water masers in the
massive star-forming region G034.43+0.24 as part of the Bar and Spiral
Structure Legacy (BeSSeL) Survey using the Very Long Baseline Array. The
parallax is 0.330$\pm$50.018 mas, corresponding to a distance of
$3.03^{+0.17}_{-0.16}$ kpc. This locates G034.43+0.24 near the inner edge of
the Sagittarius spiral arm and at one end of a linear distribution of massive
young stars which cross nearly the full width of the arm. The measured
3-dimensional motion of G034.43+0.24 indicates a near-circular Galactic orbit.
The water masers display arc-like distributions, possibly bow shocks,
associated with winds from one or more massive young stars.
