The paper contains a part of the project documentation of a small bridge - overpass over the local road in Bjelovar. At the level of the conceptual design, two variants of the overpass have been developed, in order to optimize the building in the given circumstances. Both versions envisage a single-span assembly with full abutments, ribbed cross-section, while the main spans differ - the first bridge has a span of 17.3 and the second 15.8 meters. An overpass with a span of 17.31 meters was selected for elaboration, as it was estimated that it solves the crossing well with slightly lower construction costs. The width of the bridge is 12 m, while the pavement on the bridge is 8 meters wide. An approximate static calculation was made for the selected variant - manually, with a control calculation on the computer. The dimensioning of the main girders was carried out and sketches of the reinforcement were made. Finally, a cost estimate of the bridge at the conceptual level was made.